Hi Arnold,
it is possible to read and verify the variable input. You are right when you want to use CMOD. At first you have to choose the project. In the next windows you open the Exit "EXIT_SAPLRRS0_001". Within the Function Exit you can include your code.
With the STEP=2 you can verify and read the variable values from the selection windows.
If there are any further questions don't hesitate to ask.
Nice day,
André
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