Hiding account assignment fields

I have to hide few fields in the table control of account assignment overview

PO->Item->account assignment.

UI CONTROL BADI doesnt seem to work for me

IF iv_fieldname = 'BBP_PDACC-DISTR_PERC' OR

iv_fieldname = 'T_SCREEN_ACCLIST-DISTR_PERC' OR

iv_fieldname = 'BBP_PDACC-G_L_ACCT' OR

iv_fieldname = 'T_SCREEN_ACCLIST-G_L_ACCT'.

cv_invisible = 'X'.

CLEAR cv_input_ready.

ENDIF.

any inputs anyone ?