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You can append fields to structure RV45A via transaction SE11. The append structure must have a name starting with the letter Z, and all fields inside that structure must start with 2 letters Z (like ZZNEWFIELD).
Furthermore you need to process your data in one of the available user exits (look in Program SAPMV45A for available USER EXITS).
You need to create an append structure for table VBAP (for example ZAVBAP) using SE11. In this structure you create your ZZ fields. If you need a non-SAP domain/data element for your field then you need to create it first using the same transaction and activate it. Attach ZAVBAP to VBAP so the SE11 shows:
.APPEND in the Fields column and
ZAVBAP in the Field type column.
Your ZZ fields will be shown automatically.
When you have finished then activate your ZAVBAP structure. You will notice when you go VA01 (for example) that a lot of programs are being recompiled. Don't worry. It will be ok.
The user-exit screen number for items is 8459 (in program SAPMV45A).
As Wojtek mentioned extention of table VBAP is not enough. You should also inclue your fields at appropriate screen in program SAPMV45A using screen painter.
Then your fields will be avaiable to see and program will automatically save their content.
Bluesky
