E9.2 Can't change form extension


Good morning,

I have a problem in changing a form extension already existing (P43268 - W43268A).

I reserve the form extension, I add an orchestrator bottom and I save it, but all previous changes of form extension (for example a field added in grid) are lost.
I use the standard procedure to change an UDO.

I approve the form extansion in P98220U ( 02 --> 08).

Where can the mistake be?

Thank you very much for your help.