How to stop inserting the rows

Hi all,

I have created an application in WD4A, where i added an INSERT button which creates a new row every time it is inserted. I want to put a check on it that if the rows exceed 30, it should stop inserting further rows.

being a new programmer to Dynpro, i dont have much idea about that. Please tell me how to do that & what code do i need to put to stop inserting the next row & displaying an error or Information message on the screen.

Regards

Parteek.