There is no consistency on Column lengths for Room and LDAPAccount with greater than 20 character room identifier doesn't fit because LDAPAccount.RoomNumber has only 20 characters.
Looking at the other tables with Room attribute, it is either 32 (Locality, Org) or 64 characters (Workdesk, UCI/CSMUser). Person.Room is unlimited.
==> Since RoomNumber is not in an index, has no limit in the target system and has no extra handling in OneIM, the column should be extended to 64 characters.
The data flow fits:
-PersonAuto: LDAPAccount.RoomNumber => Person.Room
-Template: Locality.Room => Person.Room => LDAPAccount.RoomNumber