How to valid inputs from user in module pool

hi,
i m using table control in module pool and in 1 of the table control fields i m using user defined F4 help which is getting filled from a internal table. if the user enters anything apart from the contents in my F4 help the record should not get saved and system should return error . how and where to put this validation?
please help.
thank you.

hi,
Write the code in PROCESS ON VALUE REQUEST in the Module pool Program ....
PROCESS ON VALUE REQUEST
FIELD <Field_name> MODULE <Module_name> ..
Double click on this field then write the function moduel to get the Internal table values when the user press F4 on that field, after completing this check by pressing the F4, if it working fine then the Validation is automatically done by this POV ..
if the USer enters other than the internal table values then the Error message will raised at that stage
Regards
Sudheer

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