Error in value-transfer between program and screen.

Hello guys.
I want ho hide one TC column when creating and changing document.
This column has to be visible when document is in display mode. And this is the
problem. I take value of the field which has to be displayed in this column from DB table into program variable p_v. In screen I have TC column with fields p_v also.
In PBO - in each loop with TC I have this value set with correct value but when the screen comes up the field is empty - no value.
Can anybody help?
Thanks a lot.
screen:
LOOP AT it_services WITH CONTROL services.
ENDLOOP.
pbo inside screen:
IF sy-tcode NE c_tcode_display.
wa_cols-invisible = 1.
MODIFY services-cols FROM wa_cols TRANSPORTING invisible.
ENDIF.

hi,
try like this,
screen:
LOOP AT it_services WITH CONTROL services.
ENDLOOP.
pbo inside screen:
IF sy-tcode NE c_tcode_display.
wa_cols-invisible = 1.
MODIFY it_services FROM wa_cols TRANSPORTING invisible.
ENDIF.
if helpful reward some points.
with regards,
Suresh Aluri.

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Error in value-transfer between program and screen.

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