outline codes

I'm having a hard time getting my estimating system to match my accounts payable system.
Is there a standard set of codes out there for different costs?
Right now I'm using my custon project WBS codes, but I'm looking for a standard.
Also, is there a system or standard for materials coding? For example is there a special code that I can apply to all HVAC materials, so that I can look them up later and run reports?
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CSI codes work well.
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