Does the way MOD() (or "mod 7") works is the digits must be 6 (via, 123456) or it must have a character and then 6 digits (via, A123456)? So, is the correct way to check/verfiy it is (this formula is for with a character and then 6 digits):

STORE SUBSTR(num,2,5) TO no
STORE MOD(VAL(no),7) TO chk
IF SUBSTR(STR(chk),10,1) = SUBSTR((no,7,1)

ELSE

ENDIF

Is that correct? I am puzzled with my supervisor saying it is the 4 digits, but the old program that I am looking uses 5 digits. I am all new to this. I never learned "mod 7" before.

Chuck

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