Diagnosis
The control key that you maintained in the operation does not exist.

System Response
INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX
Check whether you have entered the correct control key.

Procedure
INCLUDE 'NA_ALLG_VORGEHEN' OBJECT DOKU ID TX
Check whether the control key is defined in the system. Define it ifnecessary.
IF &DEVICE& = 'SCREEN'
Proceed
ENDIF