Hi Nitin,
After making all the entries on the selection-screen,go to the Debugging mode and set break-points at statement 'messages'. Once you ahve done this then execute it. By doing this way, u will be able to find the correct location of the required message. Once u find this,go to the change screen and change the warning message to Error message by changing the message type from 'W' to 'E' .
Reward points if found useful..
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