>>Actually I was just trying this code and keep getting "Operator/operand type mistmatch":
>>
>>

proIn = 61227660  &&RLCA
>>
>>lnDigit = m.proIn - (INT(m.proIn / 9) * 9)
>>		chkdig = 9 - lnDigit
>>		
>>??proIn + chkdig+CHR(13)+CHR(10)

>>
>>It must have something to do with the proIn field because the chkdig is generated fine by itself.
>
>You are combining numerics and characters (CHR()) in the last line of your code
>
>Regards,
>Pieter

Ok, at first I thought I was getting the same error when I actually tried running the page instead of just the code, but I see they're different.

When I run the server and actually try to use my page I created for this code, I get this error:

Error Number: 9
Error: Data type mismatch.

The actual code:

FUNCTION ReturnChkDig( ProIn, ValidNo )
ProIn = ALLTRIM(ProIn)
CASE validNo = 12 && RLCA
		lnDigit = m.proIn - (INT(m.proIn / 9) * 9)
		chkdig = (INT(9 - lnDigit))

OTHERWISE
		chkdig = " "
				
	ENDCASE  
		RETURN TRANSFORM(chkdig)
ENDFUNC

There are multiple cases, but this is the only one not working.