Problem:
The following problem occurs when displaying class groups for teachers and students: When the class is changed, it is no longer displayed in the UMC for the user object. Neither in the user overview, nor when calling up the user and in the group list there.
In the group module, however, the user is correctly displayed as a group member. Queries on the command line also look correct.
Solution:
General explination
If a group is now modified, i.e., renaming is essentially deleting and adding, and the user was not present for whatever reason at that moment, then the user is added to the group, but the group is not attached to the user and cannot be corrected by adding the group again. Instead, this must also be resolved by changing the group, i.e., removing the user from the group and then adding the user back to the group.
udm groups/group modify --dn cn=cat-Q2b,cn=klassen,cn=schueler,cn=groups,ou=cat,dc=schulen,dc=schein,dc=me --remove users='uid=super.kitty,cn=schueler,cn=users,ou=cat,dc=schulen,dc=schein,dc=me'
udm groups/group modify --dn cn=cat-Q2b,cn=klassen,cn=schueler,cn=groups,ou=cat,dc=schulen,dc=schein,dc=me --append users='uid=super.kitty,cn=schueler,cn=users,ou=cat,dc=schulen,dc=schein,dc=me'