How can we restrict Column length in ALV using POWL.

Hello,
I have a new assignment o ABAP Web Dynpro, data displaying ALV by using POWL is a part of that assignment. Everything went fine and at last moment I was stuck with a small issue. In my application I am displaying first ALV by using POWL concept and on the basis of selected row I am displaying second level LAV by using normal ALV procedure (SALV_WD_TABLE). Here the issue is as soon as second ALV is displaying columns in first level ALV are getting expanded. How can I restrict Column length in first level ALV using POWL. I browsed a lot for getting the solution for this, Can any one help me out from this issue.
Regards,
Kumar

Done, in field catalog method...

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How can we restrict Column length in ALV using POWL.

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