The last 4 digits of SSN and a CPN

BarclaysBoys13

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I heard that the last 4 digits must add up to the rest of the numbers or the SSN is not going to be accepted.
Banks know this rule and will flag a CPN without this formula.
How does that work? I added up my last 4 numbers in my head and they don't add up the the rest of the numbers combined.
Does anyone know how this works?
 

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