Order, Invoice & Delivery number not the same

[Lpeek]

I'm just wondering if there is a way to make the order number, invoice number and delivery slip number the same?

at the minute they all auto-increment at their own pace, which means if they will only stay in order if I generate the documents in the exact order that the orders were placed. This isn't convinient, as some orders are ready before others.

Is there no way to make all the document numbers the same? so:

order #1 has an invoice #1 and delivery slip #1

at the minute I have:

order #60 has invoice #61 and delivery #59


Thanks!