[Guide] Modifying Prestashop 1.5/1.6 Invoice Template.

[MerseyRay]

Hi,

 

I have tried all I can to get these Order messages to work.

I have followed instructions on here, but cannot get messages to display on the invoice.

 

Now a customer has just placed an order with instructions.

On the invoice it states that they have, and shows the customers name and date/time of message.. but the message is blank :/

 

See pic attached

 

Any help with this is appreciated.

 

Ray

[eleazar]

Have a look here: http://www.prestashop.com/forums/topic/266215-gelost-nachricht-in-der-bestellung/?do=findComment&comment=1329117

 

Or did you mean the back office order? In this case you find an override here: http://www.prestashop.com/forums/topic/266215-gelost-nachricht-in-der-bestellung/?view=findpost&p=1330005

Edited September 8, 2013 by eleazar (see edit history)

[howardliptzin]

I would like to add the total weight and number of boxes to the invoice template. The latter is calculated by the UPS module and is of secondary importance. The total weight, however, is part of the PS database. What code should I use to insert it into the invoice template?

 

Thanks!

[eleazar]

Which means you need two components, the total weight itself and the weight unit, right?

 

total weight should be

{$cart->getTotalWeight()} 

and weight unit:

Configuration::get('PS_WEIGHT_UNIT') 

So you should use something like that:

{$cart->getTotalWeight().'  '.Configuration::get('PS_WEIGHT_UNIT')}

Edited September 15, 2013 by eleazar (see edit history)

[howardliptzin]

 Thanks eleazar. I pasted your code in the following table. But when I try to generate a PDF, I get a server error in the browser. WHen I remove the code, the PDF is generated normally:

<table style="width: 100%">
<tr>
<td style="width: 15%; padding-right: 7px; text-align: right; vertical-align: top; font-size: 7pt;">
<!-- CUSTOMER INFORMATION -->
<b>{l s='Order Number:' pdf='true'}</b><br />
{$order->getUniqReference()}<br />
<br />
<b>{l s='Order Date:' pdf='true'}</b><br />
{dateFormat date=$order->date_add full=0}<br />
<br />
<b>{l s='Total Weight / #boxes:' pdf='true'}</b><br /><br />
{$cart->getTotalWeight().'  '.Configuration::get('PS_WEIGHT_UNIT')}<br />
<br />
<b>{l s='Payment Method:' pdf='true'}</b><br />
<table style="width: 100%;">
{foreach from=$order_invoice->getOrderPaymentCollection() item=payment}
<tr>
<td style="width: 50%">{$payment->payment_method}</td>
<td style="width: 50%">{displayPrice price=$payment->amount currency=$order->id_currency}</td>
</tr>
{foreachelse}
<tr>
<td>{l s='No payment' pdf='true'}</td>
</tr>
{/foreach}
</table>

What am I doing wrong? 

[tuk66]

What error? It looks like a syntax error.

 

Maybe <table> tag is enclosed. Put </td></tr></table> at the end.

[howardliptzin]

the browser just reports a Error code: 500.
 
when I remove that code and replace it with a series of characters such as:
 

_ _ _ _ _ _ /_ _

 
the PDF generates correctly, showing the characters in the right place, using the same exact syntax.

Edited September 17, 2013 by howardliptzin (see edit history)

[eleazar]

Problem is this part:

{$cart->getTotalWeight()}

It cannot work in invoice.tpl, I'm sorry. Whereas the weight unit will be displayed, if you just use:

{Configuration::get('PS_WEIGHT_UNIT')}

[eleazar]

Ok, had a blind spot! The above works for the cart but not for the order! Use this in your invoice:

{$order->getTotalWeight()} {Configuration::get('PS_WEIGHT_UNIT')}

Works like a charm.

[howardliptzin]

Brilliant! YES 

[[email protected]]

Hello

 

I like your PDF-Invoice.

 

But i have some errors (see the image pdf.jpg). for every text we have a ? sign. How can we remove it?

We have our shop in german.

[AlexFMS]

Hello,

 

Since the 1.5.5 i don't understand where is the invoice.tpl ?

Can you help me please ?

 

Thanks a lot !

[tuk66]

In the /pdf subdirectory.

[augis2003]

Hi,

 

maybe someone know how i can write in invoice customer fistname, lastname, postcode, city in diferent places?

I mean, now it is only delivery address as one part, but i need to make additional table in which all this info must be in diferent rows?

 

i tryed in invoice.tpl like this: {$delivery_address->city} (to get city only) but it not working...

[tuk66]

Look at getContent() function in HTMLTemplateInvoice.php. $delivery_address is already formatted address, just a string, not an object.

[Smijn1]

does anyone have an idea on how to add the customers VAT id on the invoice?

 

thanks

[augis2003]

does anyone have an idea on how to add the customers VAT id on the invoice?

 

thanks

in HTMLtemplateinvoice.php getcontent() function add:

$vatnumber=$delivery_address-> vat_number;

in smarty assign add:

$this->smarty->assign(array(  :

'vatnumber' => $vatnumber

When in invoice.tpl where you want vat number to appear add:

{$vatnumber}

OR

 

just in your backend on Countries, near Address format:

write: vat_number

And vat number will appear near customer address..

Edited September 30, 2013 by augis2003 (see edit history)

[augis2003]

Look at getContent() function in HTMLTemplateInvoice.php. $delivery_address is already formatted address, just a string, not an object.

Thanks. Your reply helped me figure out this.

[eleazar]

Hello

 

I like your PDF-Invoice.

 

But i have some errors (see the image pdf.jpg). for every text we have a ? sign. How can we remove it?

We have our shop in german.

 

Please post your invoice.tpl so that I can fix it. Or feel free to send it by PM.

[PEJ33]

I am using version 1.4.9. Can anyone tell where the invoice.tpl file is located. Is it even called invoice.tpl in this version? If it has a different name can you  tell me what it is and where to find it?

[tuk66]

There is no invoice.tpl file in v1.4.9. Look at /classes/PDF.php where invoices are created.

[SPKF]

hello,

 

I try to show some feature of my products, how do you know?

 

Best regards,

[Davallen]

Thank you very much!

Works well on 1.5.3.1 even though I just downloaded the files and implemented them

[benyv6]

Hi, anybody knows how to display other dates than the date of order? I need to display the date when invoice was generated or at least date when payment was accepted.

 

List of all variables avalible in $order will be handy.

 

Thanks,

 

 

EDIT:

 

Found it.

{$order->invoice_date|date_format:"%d-%m-%Y %H:%M"} 

 

All avalible variables are in classes/order/Order.php 

Edited October 22, 2013 by benyv6 (see edit history)

[Willem Jan]

Thanks for this guide I am really happy with this invoice and works perfect.

 

Now i am trying to get the same layout on the delivery slip for returning items but with no succes.

 

Does someone using this layout also for the delivery slip (return invoice) and can help me to get it right?

 

 

[MassiveRC]

I like to fold my invoices as they're printed and would like the customer order comments to show up below the invoice number (or besides the billing\shipping address)  instead of at the bottom of the invoice.  How can I move it?  Thanks.  Using PS default them for 1.5.2

 

Nevermind,  I figured it out.  BTW guys, if you open your invoice with Word you can test your changes before you upload them back to your PS install. 

 

Here's my modified invoice.tpl with the Order Notes moved to below the address.  I also lightened the background border and changed the text color to black in order to save on ink.

invoice.txt

Edited October 27, 2013 by MassiveRC (see edit history)

[ericosman]

How do i "remove" the header because now the header.tpl is empty but still takes his place :

[ahmed1136]

i would like to know as well how to remove the (empty) header.tpl margin

 

[sOLVED]

Found the solution myself.

Goto /classes/pdf/PDFgenerator.php

 

Around line 155 you will see

 

$this->setMargins(10, 40, 10);

Change it to

 

$this->setMargins(10, 10, 10);

Save my Day buddy thanks

[Mutabor]

How do i "remove" the header because now the header.tpl is empty but still takes his place :

 

 

Look on page 4 of this topic; http://www.prestashop.com/forums/topic/213664-guide-modifying-prestashop-15-invoice-template/?view=findpost&p=1239375

 

This change did it for me.

[ZaLuno]

Hi!

 

I have searched for a couple of days now for a specific solution for my Invoice problem, but no luck.

 

In my invoice, billing and delivery address shows like this:

John Doe

Company Ltd. (optional)

34567890 (if company is filled also Vat number) 

Address Street 15

5000 Citiy

Slovenia

30554466 (phone number)

 

Is it possible, to add some labels to numbers? like this:

John Doe

Company Ltd.

Vat no.: 34567890

Address Street 15

5000 City

Slovenia

Phone: 30554466

 

I was browsing through the invoice.tpl code and apparently invoice address is called from elsewhere. I see two solutions:

1. Find that elsewhere and add labels {l s='Vat no.' pdf='true'} and {l s='Phone' pdf='true'}.

2. Break apart (or replace) the {$invoice_address} into {$firstname} {$lastname} <br /> {$company} <br /> {l s='Vat no.' pdf='true'} :{$vat_number} <br /> {$address1} <br /> {address2} <br /> {$postcode} {$city} <br /> {$countryName} <br />  {l s='Phone' pdf='true'}: {$phone_number}

 

Can someone point me in the right direction? I really need this fixed because of the laws and accounting issuies such unmarked numbers bring.

[Housy]

Hi 

 

First of all thanks for your time, you are great!

I do have a little problem.

 

I'm from Slovenia and in my store I'm using Slovenian language, which has characters like "č, š, ž, đ, ..." but i get question marks, when this characters are used.

 

How could i set UTF-8 encoding?

 

That might solve this problem, i guess ...

 

Regards, Housy

[ZaLuno]

Housy,

 

On our site we solved the problem by using different font. I reccomend Trebuchet MS, Arial or other fonts, that are commonly used on web to display Slovenian language properly. UTF-8 encoding usually comes enabled as standard option in Prestashop. Also in your BackOffice make sure you change Administration language to Slovenian - this is very important! (Translations are a disaster, but with some elbow grease, you can translate what you think you need)

 

When testing out fonts, make sure the € sign also remains normal. In some cases fonts start displaying čšćđž, but € character gets lost.

 

I hope this helps

[Housy]

Hi ZaLuno,

 

i have changed charset to "freeserif" and it is ok for now. I'm gonna use other font as you suggested.

 

Thanks

Housy

 

Housy,

 

On our site we solved the problem by using different font. I reccomend Trebuchet MS, Arial or other fonts, that are commonly used on web to display Slovenian language properly. UTF-8 encoding usually comes enabled as standard option in Prestashop. Also in your BackOffice make sure you change Administration language to Slovenian - this is very important! (Translations are a disaster, but with some elbow grease, you can translate what you think you need)

 

When testing out fonts, make sure the € sign also remains normal. In some cases fonts start displaying čšćđž, but € character gets lost.

 

I hope this helps

[mbp]

How can i make the deliveryadress alwas stay on the right side?

 

I use a Single Integrated Label Style C so deliveryadress must stay on same place.

 

Using 1.5.6.0 orginal .tmpl

 

 

----------

 

I solved it my self.

Edited November 17, 2013 by mbp (see edit history)

[ZaLuno]

Is it possible, to add some labels to numbers? like this:

John Doe

Company Ltd.

Vat no.: 34567890

Address Street 15

5000 City

Slovenia

Phone: 30554466

 

I was browsing through the invoice.tpl code and apparently invoice address is called from elsewhere. I see two solutions:

1. Find that elsewhere and add labels {l s='Vat no.' pdf='true'} and {l s='Phone' pdf='true'}.

2. Break apart (or replace) the {$invoice_address} into {$firstname} {$lastname} <br /> {$company} <br /> {l s='Vat no.' pdf='true'} :{$vat_number} <br /> {$address1} <br /> {address2} <br /> {$postcode} {$city} <br /> {$countryName} <br />  {l s='Phone' pdf='true'}: {$phone_number}

 

Can someone point me in the right direction? I really need this fixed because of the laws and accounting issuies such unmarked numbers bring.

Please anyone? This is very important and I believe that I am not the only user needing this ...

[tuk66]

Look at Adress Format under Countries.

[maio]

@MerseyRay

instead of using this

 

<tr>
<td style="width: 50%; text-align: right">Invoice Number :</td>
<td style="text-align: left">{$title|replace:'Invoice #':'':'htmlall':'UTF-8'}</td>
</tr>

 

try

<tr>
<td style="text-align: left">{$title|replace:'Invoice #':'Invoice Number :':'htmlall':'UTF-8'}</td>
</tr>

I think the replace function is better off ...

[Leez300]

Hi

Got a problem. I have placed an img src html code in pdf/invoice.tpl (and the image itself in the same folder).

And then got the error "TCPDF ERROR: [image] Unable to get image: 8x8t.gif" in BO orders.

Then I removed the image coding in invoice.tpl, expecting the error to disappear, but it didn't..!

 

Pls, what to do?

 

Ver. 1.5.4.1

 

Lee

[satinder]

Everything went ok as per the solution provided , I was curious if we can have Serial Number of Products in Product Tab List (Right Aligned) and some good CSS so that it looks a real professional Invoice

[Orange35]

Hi

Got a problem. I have placed an img src html code in pdf/invoice.tpl (and the image itself in the same folder).

And then got the error "TCPDF ERROR: [image] Unable to get image: 8x8t.gif" in BO orders.

Then I removed the image coding in invoice.tpl, expecting the error to disappear, but it didn't..!

 

Pls, what to do?

 

Ver. 1.5.4.1

 

Lee

clear cache?

[enigma7291]

Hello!

how can i add shop info to the invoice!

I found these variables

 e.g.: 

 

{$shop_address|escape:'htmlall':'UTF-8'}

{$shop_details|escape:'htmlall':'UTF-8'}

 

... but every info appear in one line. 

 

I would like to see the values:

shop name

address

tel:

fax:

etc:

which variable can i get these info ?

[Rebel Tech]

Here we are

 

if you want you can share your work on this page

 

I think this is a very nice option for people

[Ganesh Hipparkar]

Hello every one,

 

In Orders->Invoices menu when we generate pdf  file by date at that time all orders between two dates are printed in invoice file.

what i want is show a All Order Total: variable at the last page of the pdf and show there all orders total.

 

Thanks,

Ganesh

[martin776019]

I have an empty space in the footer, how do I remove it?

please help, thank you.

[enigma7291]

Hello! 

workaround for the #141 problem!

In the suitable place I inserted this: {$shop_address|replace:'-':"<br>"}

Because the {$shop_address} variable contain the info "-" separated, thus the above modifier will brake new line the info !

[Ganesh Hipparkar]

Hi,

 

     how to display a text at the last page of pdf while generating invoice.text should be display before the footer.

     some one help please.

 

Thank you

Ganesh

[edoluz]

Here we are

 

if you want you can share your work on this page

Thank you very very much for this page! I downloaded the Supremacy2k  (Author: Supremacy2k) and it's a great solution for my needs!

Thank you!

[shroom]

I'd like to use the country iso code on the invoice.tpl file, taking advantage of the "country" object already declared in the "HTMLTemplateInvoice" file, though assigning the "iso code" to smarty crashes the pdf generation.

 

Any clue on how to properly send the iso code value to the tpl file?

Edited February 19, 2014 by shroom (see edit history)

[kalakrima]

Hi everybody,

 

All those usefull informations helped me a lot, thank you!

 

But I have a very weird issue with PDF invoice. The euro symbol and sometimes french accents doesn't displays correctly. I spent five hours to search a solution for this issue and didn't find it. So I hope that you can help me. Firstly, I thought that is because I've made some changes to the template, so I've installed a new fresh version of prestashop 1.5.6.2 without any modifications, but the problem was the same. I've looked in the Php admin, the table are well coded un UTF-8, the prices displays correctly on front office, but not in the invoice... You can see the picture attached bellow of this issue.

 

Can you tell me, please, how to solve this issue?

 

Edited February 24, 2014 by kalakrima (see edit history)

[kalakrima]

Hi everybody,

 

All those usefull informations helped me a lot, thank you!

 

But I have a very weird issue with PDF invoice. The euro symbol and sometimes french accents doesn't displays correctly. I spent five hours to search a solution for this issue and didn't find it. So I hope that you can help me. Firstly, I thought that is because I've made some changes to the template, so I've installed a new fresh version of prestashop 1.5.6.2 without any modifications, but the problem was the same. I've looked in the Php admin, the table are well coded un UTF-8, the prices displays correctly on front office, but not in the invoice... You can see the picture attached bellow of this issue.

 

Can you tell me, please, how to solve this issue?

 

 

Ok, it's really weird... When I open my file with other program then Acrobat, everything seems ok, but when I'm opening it with Acrobat, my currency symbol is replaced by this weird sign.. Somebody know how to fix this? My acrobat version is the last.

[tuk66]

PDF files can contain fonts used in the document. Sometimes just trust PDF reader that fonts are already installed.

 

This issue is about the fonts. Used, enclosed, installed. Search this way.

 

A small note. The M4 PDF Extensions module always include fonts for all characters in document. Then there are absolutely no problems with fonts.

[kalakrima]

PDF files can contain fonts used in the document. Sometimes just trust PDF reader that fonts are already installed.

 

This issue is about the fonts. Used, enclosed, installed. Search this way.

 

A small note. The M4 PDF Extensions module always include fonts for all characters in document. Then there are absolutely no problems with fonts.

 

Hi, thank you for your help. I resolved the problem with Acrobat by setting "dejavusans" font by default for PDF Generator. May be this could help anyone in my case.

[karthiiiiiiiiiik]

hi rhapsody,

 

can i use the same solution for prestashop 1.5.6.1 , i have tried your solution but i am not getting anything... can you provide the solution..

 

what i did is ?

 

override the htmltemplateinvoice file, and posted the message display value in pdf/invoice.tpl file, but i am not getting the customer comments in invoice..

Edited March 2, 2014 by karthik who_am_i (see edit history)

[Rhapsody]

hi rhapsody,

 

can i use the same solution for prestashop 1.5.6.1 , i have tried your solution but i am not getting anything... can you provide the solution..

 

what i did is ?

 

override the htmltemplateinvoice file, and posted the message display value in pdf/invoice.tpl file, but i am not getting the customer comments in invoice..

I am using this solution on 1.5.6.2 and previously on 1.5.6.1 with no problem.  Did you clear your cache and recompile using the BO under advanced options, performance?

[karthiiiiiiiiiik]

you have mentioned to paste the customer message in theme/pdf/invoice.tpl i have pasted in pdf/invoice.tpl and not in the themes/pdf directory no pdf directory in themes.. i will clear the cache and try..

Edited March 2, 2014 by karthik who_am_i (see edit history)

[Rhapsody]

Create the themes\your_theme_name\pdf and put any modified pdf template files there.  That way whenever you upgrade your changes will not be overwritten.

[karthiiiiiiiiiik]

hi rhapsody it is working ...

 

Thanks for your solution...

[patrmich]

Hi,

In Prestashop 1.5.6, on the current pdf invoice default model, one column is entitled "Product / Reference"
In such column :
- the item reference value is missing
- in the same cell, are the item title value and the attribute item value.

I would like to know how to have 3 distinct columns :
    - one column for item Reference
    - one column for item title
    - one column for item attribute

Thank you in advance for any reply.

Patrick

[weckie]

How can i get customers email on invoice and/or packing slip.

 

I know how to get it in the adress field but i want it to display in some other area on invoice and slip.

 

{$customer->email}  does not work.

 

thanks in advance.

[Torbz]

Hi,

 

In Prestashop 1.5.6, on the current pdf invoice default model, one column is entitled "Product / Reference"

In such column :

- the item reference value is missing

- in the same cell, are the item title value and the attribute item value.

 

I would like to know how to have 3 distinct columns :

    - one column for item Reference

    - one column for item title

    - one column for item attribute

 

Thank you in advance for any reply.

 

Patrick

Ditto with Patrick on this one - the product reference used to appear in a separate column (PS v1.3) but after upgrading recently, my client is complaining that the product reference is now missing, so it's more difficult for her to be sure of the item ordered, at a glance.

 

See my next post for my solution

Edited March 11, 2014 by Torbz (see edit history)

[Torbz]

(Relevant to v.1.5.6.2)  

 

Ok, Patrick sussed it out:

 

In {install folder}/pdf/invoice.tpl is the following around line 129:

<!-- PRODUCTS -->
				{foreach $order_details as $order_detail}
				{cycle values='#FFF,#DDD' assign=bgcolor}
				<tr style="line-height:6px;background-color:{$bgcolor};">
					<td style="text-align: left; width: {if !$tax_excluded_display}35%{else}45%{/if}">{$order_detail.product_name}</td>
					<!-- unit price tax excluded is mandatory -->
					{if !$tax_excluded_display}
						<td style="text-align: right; width: 20%; white-space: nowrap;">
						{displayPrice currency=$order->id_currency price=$order_detail.unit_price_tax_excl}
						</td>

I then added this to line 133    (Ref. {$order_detail.product_reference})

 

e.g.

<td style="text-align: left; width: {if !$tax_excluded_display}35%{else}45%{/if}">{$order_detail.product_name} (Ref. {$order_detail.product_reference})</td>

which gave me the product reference at the end of the item description.

 

I know you want to create extra columns so you need to add a TD cell to the template around there to get the desired effect.

Edited March 11, 2014 by Torbz (see edit history)

[patrmich]

Hi,

 

Thank you to Torbz for the reply that worked well.

 

1- On the pdf invoice everything is translated into French except for the title of the column "Product".

I did not find where to translate Product into Produit

Any idea ?

 

2- On the pdf invoice is a column "Discount" (Réduction in French)

Is there a way to display this column only when a discount has been applied ?

 

Thank you in advance for any reply.

 

Patrick

[fortuner]

Does anyone know how to add a customer message to invoice? Please, help

[Rhapsody]

Does anyone know how to add a customer message to invoice? Please, help

The solution is in my Post #80 in this thread.

[fortuner]

The solution is in my Post #80 in this thread.

Thank you, works perfect!

One last question: html tags for bold text dont work, neither <b>, nor <strong>, not even <span style="font-weight: bold;">

Is that a common problem, or just mine?

[guessous]

thanks for your topic

Hi evrebody plz i have this probmlem 

I have an empty space in the footer, how do I remove it?

please help, thank you.

Edited April 1, 2014 by guessous (see edit history)

[Onedirection]

Hi Supremacy2k,

 

Thanks for sharing this guide.

 

Could you please tell me where I can delete below text in the pdf invoice?

It's about the VAT. I dont want it visible on the invoice.

 

 VAT details          VAT %             Total amount             Total amount

                                                       without VAT                  VAT

 

 

Thanks for your help!

[tuk66]

Disable getTaxTabContent() function in /classes/pdf/HTMLTemplateInvoice.php. To return '' is all right.

[roz]

hi! anyone knows how can i

1. add in the Features in the product list
2. add in Customer Name 
3. add in Delivery Date & Time
4. add in Order Status

in my Invoice. can anyone help me? thanks in advance

[donneljo]

How can i get customers email on invoice and/or packing slip.

 

I know how to get it in the adress field but i want it to display in some other area on invoice and slip.

 

{$customer->email}  does not work.

 

thanks in advance.

 

I am trying to figure this one out too.  Did you have any success with this?

[Onedirection]

Just try to change {$customer->email} to {email} or {mail}

[donneljo]

Just try to change {$customer->email} to {email} or {mail}

No that just breaks the template

[mikemiranda]

Hello guys, can anyone help me put an image/icon on my template? a already tried <img src='{$img_dir}mail.png' alt='mail'> and <img src='mail.png' alt='mail'> on the same directory, but nothing works, please i had my template 90% done.

 

 

Thanks in advance

Edited May 18, 2014 by mikemiranda (see edit history)

[tuk66]

See the getLogo() function in the /classes/pdf/HTMLTemplate.php fiel how the full path for the logo is created.

[mikemiranda]

See the getLogo() function in the /classes/pdf/HTMLTemplate.php fiel how the full path for the logo is created.

Sorry is not the logo i want is a simple image

[tuk66]

I know but you can learn from that what works.

[eR3Ms]

Sorry, my mistake.

Edited May 27, 2014 by eR3Ms (see edit history)

[patrikar]

Include order number in header / Have the header on all pages

 

When using OP's solution for adding order number to the header of the PDF. Then the header doesn't show up on every page in the pdf but only the first.

 

I got a solution for this problem. So that you can have order number in the header and at the same time have the header appearing on all pages.

 

Step 1. In header.tpl do nothing! This could still be used for other PDF's than invoice.

 

Step 2. In invoice.tpl, add your header code at the top. Something like the content of header.tpl with order number added.

 

Step 3. In invoice.tpl, after your header code. Add this: <!-- END OF HEADER -->

 

The top of invoice.tpl could now look like this:

<table style="width: 100%">
<tr>
	<td style="width: 45%">
		{if $logo_path}
			<img src="{$logo_path}" style="width:{$width_logo}px; height:{$height_logo}px;" />
		{/if}
	</td>
	<td style="width: 5%"> </td>
	<td style="width: 50%; text-align: right;">
		<table style="width: 100%">
			<tr>
				<td style="font-weight: bold; font-size: 14pt; color: #444; width: 100%">Invoice</td>
			</tr>
			<tr>
				<td style="font-size: 14pt; color: #9E9F9E"> </td>
			</tr>
			<tr>
				<td style="font-size: 14pt; color: #9E9F9E">{$order->getUniqReference()}</td>
			</tr>
		</table>
	</td>
</tr>
</table>
<!-- END OF HEADER -->
<!-- ADDRESSES -->
<table ...

Step 4. In /override/classes/pdf/PDFGenerator.php add the function createContent() like below:

<?php

class PDFGenerator extends PDFGeneratorCore
{
	
	/**
	 *
	 * create the PDF content
	 * @param string $content HTML
	 */
	/*
		Override: if header is provided in content, override the header
	*/
	public function createContent($content)
	{
		
		$pieces = explode('<!-- END OF HEADER -->', $content, 2);
		
		if( count($pieces) == 2 ) {
			$this->header = $pieces[0];
			$this->content = $pieces[1];
		}
		else {
			$this->content = $content;
		}
	}
	
}

Done!