Is there any to restrict the no of display fields in alv grid using oops?

hi,
i have 100 field in an internal table , and i passed that internal table to set_table_for_first_display, Now my aim is to display only 20 fields among that 100, these twenty may vary based on selection but count of fields should be always 20. Is it possible .....

Yes!! youhave to prepare the field catalogue dynamically..based upon the selection..get the names of all the fields to be displayed ..take first twenty of them and for the rest of the fields in the internal table which are not in these twenty..mark no_out = 'X'.

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Is there any to restrict the no of display fields in alv grid using oops?

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