Hi Borris,
Please check in Config .Cross Application Components - Sap Business Partner - Business Partner - Number Ranges and Groupings - Define Groupings and assign number ranges. In there you will find that your grouping ZVND is probably selected in the Int.Std.Grouping. This is why your account group is defaulting to ZVND. Unfortunately you can only have one Standard grouping in Business Partner and I assume it will be the default for Vendors and Customers in your change requests.
We have the same problem and once the Int.Std.Grouping is selected, you can't switch it off and only change the default to another group. In our Vendor UI, derivation only happens when we enter the account group and thus when we create a change request it defaults to the wrong account group.
We wrote a validation rule that indicates that the accountgroup 8888 is not allowed and that the correct account group should be entered, because . Unfortunately this will only come up once you hit the check buton or submit it if your settings are done correctly.
Thanks and best regards
Riaan
