We are on SAP 4.6C. I am trying to create a validation on WBS elements
for a project. Using transaction GGB0. I would like to issue an error
message from a different custom message class. However, I cannot
change the message class for the WBS element validation. The "Message
ID" field on the Create/Change Validation screen is greyed out and the
Extras -> Change Message Class is also greyed out.
Any suggestions would be greatly appreciated.