Problems with the "Pre-view" button in an OO ALV!

Hey all,
I have a problem with my OO ALV...when I press the "Pre-View" function button from my ALV I get a dump.
It says "Fieldsymbol not yet assigned".
I check my Fieldcatalog, my out_itab of the ALV....I do not know where is the problem.
When I use the debugger I get the place where the dump occures, but I do not know why it occurs....
When the ALV tries to convert the content of my ALV the dump occurs. The Fieldcatalog does not seemes to be the problem, because SAP convert the catalog correctly, but when he tries to convert the rows of my ALV he crashes...but only after the second row. The first row of the content he convert, but when he tries to convert the second row....bumm!!!
Does somebody has an idea? Or does somebody knows of a generelly problem with OO ALV's which could be the reason for my problem?
I apreciate any help.
Thanks a lot.
Marcelo

please reward points if your problem solves.
and try to close the thread.
thansk and regards
vijay
Message was edited by: Vijay Babu Dudla

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