Fill-In validation with N format

I have a fill-in with the following code, made using the AppBuilder

DEFINE VARIABLE fichNoBuktiTransfer AS CHARACTER FORMAT "N(18)":U
LABEL "No.Bukti Transfer"
VIEW-AS FILL-IN NATIVE
SIZE 37.2 BY 1 NO-UNDO.


Since the format is N, it blocks the user from entering non-alphanumeric entries. However, it does not prevent the user from copypasting such entries into the fill-in. I have an error checking like thusly to prevent such entries using the on leave trigger:

IF LENGTH(SELF:Screen-value) > 18 THEN DO:
SELF:SCREEN-VALUE = ''.
RETURN NO-APPLY.
END.
vch-list = "!,*, ,@,#,$,%,^,&,*,(,),-,+,_,=".
REPEAT vinl-entry = 1 TO NUM-ENTRIES(vch-list):
IF INDEX(SELF:SCREEN-VALUE,ENTRY(vinl-entry,vch-list) ) > 0 THEN DO:
SELF:SCREEN-VALUE = ''.
RETURN NO-APPLY.
END.
END.


However, after the error handling kicked in, when the user inputs any string and triggers on leave, error 632 occurs:

error 632 occurs

Is there any way to disable the error message? Or should I approach the error handling in a different way?

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