Adding new product conditions

[Medea Web Agency]

Hi people, 

i'm trying to change the product conditions, searched the forum for a solution but i can't figure out how to make it work.

 

I did these steps:

1. Changed the ps_product and ps_product_shop table
2. Edit the admin/themes/default/template/controllers/products/informations.tpl file
3. Edit the classes/Product.php file
4. Edit the themes/mytheme/product.tpl

All seems ok in the backend, i can see the new conditions label as you can see

 

 

But when i save, it shows me always the default label, nothing changes. 

And in the frontend, it shows nothing except the word "Condition:"

 

How to solve? Thanks!!