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How to validate input in Modulepool program

Hi Dears,

I have screen 200. For one of the input field when it has the value coming by default with 'S' i need to allow only 'F' as input if user wants to change. If input is coming by default with 'F' I need to allow 'S' as input if user wants. How can I control this input in module pool programming.


Former Member
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