Diagnosis
The system has set the employee's activity key to the default value inaccordance with table T5D13. The default value is used when featureDFINF (use of default values in infotypes) returns the value 'X' forinfotype 20.

System Response
This change of activity key is a DEUEV notification reason. If youretain this activity key, the system creates DEUEV notifications(deregistration/registration).

Procedure
Check the employee's activity key.