Not really.  The only decision maker in paragraph language is a one-test IF.  
You'd need lots of these and would still need to predict every variation.
But you could run a program that validated the input, then wrote the result in 
a known location, and retrieve it from there.
RUN BP VALIDATE <<ENTER CUSTOMER NUMBER>>
* <<A,F(VOCLIB,CUSTNO,1),ENTER CUSTOMER NUMBER>>
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