I am working on Metro 2 Parameters and having alot of trouble with one of the parameters:

"Default Purpose Codes cross referenced to Account Codes"

I don't see any way that our Purpose Codes, within our core loan system, can cross to Metro 2's Account Codes. It seems like I am trying to fit a square block into a round hole? Anyone have experience with this that can help me? Please?!
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Just working here until I get my letter from Hogwarts.