To add validation at transaction PA30, you have to add code at include.
CASE innnn
-infty
.
WHEN '0000'.
PERFORM f_0000
CHANGING innnn
.
WHEN '0001'.
PERFORM f_0001
CHANGING innnn
.
...
...
WHEN '0267'.
PERFORM f_0267
USING innnn
.
WHEN OTHERS.
ENDCASE.
FORM f_0000 was declared at new subroutine pool Z as below.

at
PA30 message error will be raised as you wish.
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