How to Hide SAP ABAP Table Control Column dynamically (at PBO) ?

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SAP

Following code in PBO doesn't work to hide the column completely.

LOOP AT SCREEN.

    IF SCREEN-NAME EQ 'GT_SO-POSNR'
      SCREEN-INPUT = 0.
      SCREEN-ACTIVE = 0.
      SCREEN-INVISIBLE = 1.
      MODIFY SCREEN.
    ENDIF.
ENDLOOP.

But above is disabling the column, not hiding it. Any help how to hide the Column? Thx inadvance.