Only one row appendable at a time in alv

I would like to limit only one blank row at a time in my alv grid. Means, if i append a row using the standard "Append Row" Button, the user should not be able to append a second blank row till he fills out the first one.
Any hints ??
regards,
Priyank

Hi Sascha,
Thanks for the reply but it does not work.
i put some code in the ...AFTER event, but it seems it is not executed on clicking the append button. I set a breakpoint there but it did not break.
any other suggestions?
my main problem is that when i append multiple rows in the alv and subsequently save the data from this alv grid, somehow one field is getting cleared and not holding the value the user has entered. for example, if i add 5 rows and then put data in these rows and save it, second row shows an initial value for a date field in the table. rest of the rows hold the correct value.  i don't know if it is a webdynpro bug or my mistake...i tried redoing everything but to no avail...same problem everywhere.
thus i m trying to restrict the user to one row at a time only. it will be ideal if i can somehow solve the original problem. if not, even restricting to one row will be good enough.
regards,
Priyank

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