SAP Message 5AT153 - System error: the object &1 &2 has no relationships

Diagnosis
The system is supposed to read the attributes of the object &1 &2.However, no attributes are maintainable for this object, and it is notassigned to a position or organizational unit.

System Response
It is not possible to read the attributes.

Procedure
If you are dealing with a system user (object type US), relate the userto a position (or central person).