How to allow user to edit Purchase Order type at any time?

Question

Client has requested if it would be possible to edit the PO type, i.e. using the transaction ME22N, in any scenario.

Is there a way in ABAP to make this change?

Answer 1

No, order type cannot be edited after PO creation (ME21n).

ME22n is the order edit transaction which allows edit some order parameters, but not all. and order type is the fundamental PO parameter which defines bunch of business logic: release strategy, delivery schedule, billing, shipping and so on.

It is conceptually wrong to try to change the order type on order change, it's simpler to create a new order with a correct type.