I am trying to add a custom REP field in v12 to the CRM project. I have added the field to the OPPOR table and the OPP1 screen. I can select a value in the field in the GESOPP function, but when the record is created / saved, the value in the field vanishes and is not added against the record in the table.

This works fine in PU9, so I expect it is something to do with the new PJM functionality, but I can't work out what I need to do to be able to add the custom field to the Project.