A Page down dump

I am having a problem when i am doing page down in my code.
I have made an interactive ALV. in the detailed list when i press the page down button for the second time it gives me a dump.
ASSERT condition has been violated.
I have put this question before but didnot get any answer.
Can anybody help me out with the solution?
Loads of Thanks in advance

put a break point at event subroutine for the detailed list u have maintained. execute and check sy-ucomm in event subroutine.
or
put /h when detailed list has displayed and press page down then u can find the error in the source code.
or
drag and drop the shotcut key of system command of /h when detailed list has displayed.
use any of these 3, u can find the error in the code.

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