Sage 500 Upgrade - Error 13

SUGGESTED

upon trying to save an invoice I am receiving this error in my testing of Sage 500 2013:

Module: Company: TT1 AppName: ProcessInvoices Error <13> occurred at <frmInvcEntry> in Procedure <DMPostSave> Type mismatch. 

happens on each and every invoice.  Could anyone please advise?

Thank you.

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