Hide or Invisible some field at Sales tab in VA01 tcode

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Hi expart,

I want to invisible some field like 'Billing_block' & do as flows.

But when I active that & execute tcode it was hang .

FORM USEREXIT_FIELD_MODIFICATION.

* CASE SCREEN-GROUP3.
* WHEN '900'.
* IF VBAK-VBTYP NE 'A'.
* SCREEN-ACTIVE = 0.
* ENDIF.
* ENDCASE.

* CASE SCREEN-NAME.
* WHEN 'VBAK-VBELN'.
* SCREEN-ACTIVE = 0.
* ENDCASE.

"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""$"$\SE:(1 ) Form USEREXIT_FIELD_MODIFICATION, End D
*$*$-Start: (1 )--------------------------------------------------------------------------------$*$*
ENHANCEMENT 312 ZSD_SCREEN_MODIFICATON. "active version

IF ( SY-TCODE EQ 'VA01' OR SY-TCODE EQ 'VA02' ).
if sy-dynnr = '4440'.

loop at SCREEN .

if screen-name = 'VBAK-FAKSK'.
screen-input = 0.

modify screen.
exit.
endif.

ENDLOOP.
endif.
ENDIF.
ENDENHANCEMENT.
*$*$-End: (1 )--------------------------------------------------------------------------------$*$*
ENDFORM.

Can anybody help me.

Regards.