SAP Note 26575 - Variable lists: Termination when pressing F4

Symptom:

The variables lists / object overviews terminate when you press the F4 possible entries pushbutton.

Cause and prerequisites

If the field you have selected with the cursor has no DDIC reference, the help module processes a termination.

Solution
If the field you have selected with the cursor has no DDIC reference, you must not call the help function module.
Instead, a message must be issued in this case.