SAP Message UD034 - Please enter a valid command

Diagnosis
An attempt was made to execute a function that cannot be executed bythe program. There are two possible reasons for this happening.
1. If you selected the function via menu options, a program error hasoccurred.
2. If the function was entered directly via the OK code, the functionis invalid.

Procedure
For 1: Please inform the Dictionary hotline at SAP AG.
For 2: Select the function via menu options or enter a valid OK code.