Answer Posted / saurabh shrivastava

If the validation has to be done for more than one field the
those fields are included between chanin and endchain.
Ex
In PAI if you want to validate group of fields put in
chain and End chain statement .


You can declare fields in the chain enchain .


CHAIN.
FIELD chk_ABC.
FIELD chk_DEF.
FIELD chk_GHI.
FIELD CHK-JKL.
MODULE CHK_screenfields.
ENDCHAIN.


MODULE CHK_screenfields INPUT.
CLEAR okcode.
okcode = sy-ucomm.
CASE okcode.
WHEN 'ENTER' OR 'EXECUTE'.

IF chk_ABC IS INITIAL AND chk_DEF IS INITIAL AND CHK_GHI
IS INITIAL .
MESSAGE e000(zo_spa) WITH text-017. " Enter VALUES'
ELSE.
.....
ENDIF.
ENDIF.

ENDMODULE. " modify_screenfields INPUT

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