skip validation at exit or cancel (module pool)

Hi Experts,

How can I skip validation while user select exit button.

i am validating the fiels by Module statment as given below.

please give your valuable suggestions if it is wrong logic.

Example

Flow logic

MODULE VALIDATE_VENDRNO_9001.

Program

&----

*& Module VALIDATE_VENDRNO_9001 INPUT

&----

• text

----

MODULE VALIDATE_VENDRNO_9001 INPUT.

DATA : L_LIFNR TYPE LIFNR,

L_NAME TYPE NAME1.

SELECT SINGLE LIFNR NAME1 FROM LFA1 INTO (L_LIFNR, L_NAME)

WHERE LIFNR = W_GEH-VENDR.

IF SY-SUBRC NE 0.

CONCATENATE 'CHECK VENDOR NO' ZGEH-VENDR INTO G_TEXT SEPARATED BY SPACE.

MESSAGE G_TEXT TYPE 'E'.

CLEAR G_TEXT.

ELSE.

MOVE L_NAME TO W_GEH-VNAME.

ENDIF.

ENDMODULE. " VALIDATE_VENDRNO_9001 INPUT

Thanks & Regards,

Devalla T Kumar