Make cells of Table control grayed out(input disabled) based on condition

Hello Experts,
I have a requirement where the data is getting populated in table control from my custom tables.
Now in three columns of the table control if the data is coming as blank from z table then I have to show the cell as editable so that user can put the data and it can be saved back in custom table but If some data is coming from custom table and it is shown in the table control then the cell should be grayed out(Non Editable).
To achive this I'm using the Following piece of code but it is not working still.
In PBO
loop at   gi_actual_tc
       into gw_actual_tc
       with control tc_actual
       cursor tc_actual-current_line.
       module tc_get_lines.
endloop.
MODULE tc_get_lines OUTPUT.
data : lv_index TYPE sy-index,
       lv_index1 TYPE sy-index.
lv_index = sy-tabix.
CHECK gw_actual_tc-zlc_subcon IS NOT INITIAL.
LOOP AT SCREEN.
IF screen-name = 'GW_ACTUAL_TC-ZLC_SUBCON'.
     lv_index1 = sy-tabix.
     IF lv_index = lv_index1.
     screen-active = 0.
     exit.
     ENDIF.
    screen-intensified = 1.
ENDIF.
MODIFY SCREEN.
ENDLOOP.
ENDMODULE.
Please let me know where I'm missing the trick here.
Thanks,
Jai

hi ,
LOOP AT SCREEN.
IF ( screen-name = 'GW_ACTUAL_TC-ZLC_SUBCON' AND
gw_actual_tc-zlc_subcon IS NOT INITIAL )
OR ( screen-name = ' GW_ACTUAL_TC-ZLC_SCWORK' AND
gw_actual_tc-zlc_scwork IS NOT INITIAL )
OR ( screen-name = 'GW_ACTUAL_TC-ZLC_VALJOB' AND
gw_actual_tc-zlc_valjob IS NOT INITIAL ) .
change code to below code if it is character field
IF ( screen-name = 'GW_ACTUAL_TC-ZLC_SUBCON' AND
gw_actual_tc-zlc_subcon IS INITIAL )
OR ( screen-name = ' GW_ACTUAL_TC-ZLC_SCWORK' AND
gw_actual_tc-zlc_scwork IS INITIAL )
OR ( screen-name = 'GW_ACTUAL_TC-ZLC_VALJOB' AND
gw_actual_tc-zlc_valjob IS INITIAL ) .
IF field is type P or I
then
IF ( screen-name = 'GW_ACTUAL_TC-ZLC_SUBCON' AND
gw_actual_tc-zlc_subcon =0 )
OR ( screen-name = ' GW_ACTUAL_TC-ZLC_SCWORK' AND
gw_actual_tc-zlc_scwork =0 )
OR ( screen-name = 'GW_ACTUAL_TC-ZLC_VALJOB' AND
gw_actual_tc-zlc_valjob =0 ) .
screen-input = 1.
MODIFY SCREEN .
ENDIF.
ENDLOOP.
regards
Deepak.

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Make cells of Table control grayed out(input disabled) based on condition

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