Change Order / order Revision / what to print?

Hello everybody,

First of all I think I don't understand correctly the functionality between change order and order revision on Purchase orders (PO).

I would like to setup my system following below requirements:

- At any time of a PO lifecycle (even after partial receiving), buyers must be able to update the PO. (increase or decrease quantities, change costs, add new items, remove items, ...)

- System should have the functionality to set a 'revision number' that will be printed out on the purchase order. That revision number must be sequenced in order that even if internally several revisions have been done, suppliers only see a sequenced number without gaps example: 1,2,3,4 --> OK   but 1, 3, 5, 6, 9 ---> NOK