Field help (REVNUM) 

This field cannot be entered. It is only loaded when order revisions are managed (SALREV - Revision management parameter (VEN chapter, ORD group)). It displays the last revision number created for the order.

When you modify an order, the original values (before modification) are saved in the history of revisions and the revision number is incremented:

To view the history of revisions and detailed modifications, click: