Problem in Module Pool-fill required entry

Hi,

I have taken one text field mandatory if condition is true then this filed make obligatory and condition is false then text filed will hide. its working properly.

but my problem is when i am changing the input value and this condition is false then also showing error 'fill required entry.' and after filling required entry the field is hiding.

so i want to show when i will changing the input value, suppose condition is true then field will hide without showing error MSG "fill required entry."

please help!!!

ex:

MODULE ABC OUTPUT.

IF zcustomer-cve_aut = 'B'.

LOOP AT SCREEN.

IF screen-name = 'name'.

screen-required = '1'.

MODIFY SCREEN.

ENDIF.

ENDLOOP.

ELSE. "if other c,d....

LOOP AT SCREEN.

IF screen-name = 'name'.

screen-required= '0'.

screen-invisible = '1'.

screen-active = '0' .

MODIFY SCREEN.

ENDIF.

ENDLOOP.

ENDIF.

ENDMODULE.

Thanks!!

Dipak.