Your question looks like a request I am working on.

My solution (for seeing which outgoing order has been printed) was:

• create a boolean for model stock.move
• create a custom module within the folder report, which marks the boolean true
• add the field to the various screens and/or reports

Just found a bug: when doing a partial delivery, the boolean is still true for the backorder... Just need to modify the copy action of stock.move to set it to false.

Hopefully you can use my steps to do your modification.....