I have an integration that has been running fine for quite a while for several customers.  I am trying to impliment this integration for a new customer.  When I try to add a Bill, I get an error.

INSERT INTO BillExpenseLine(VendorRefFullName,ExpenseLineAmount,ExpenseLineAccountRefFullName,ExpenseLineMemo,FQSaveToCache) VALUES ( 'QUA001', 451.89,'Accounts Payable:AP - MAX','700000920000',1)  

 INSERT INTO Bill(VendorRefFullName,TxnDate,RefNumber,TermsRefFullName,Memo) VALUES ( 'QUA001',{d'2008-09-02'},'25661-70000092','NET 30','AP00003 1000')  

 [QODBC] Error: 3180 - There was an error when saving a Bill.  QuickBooks error message: Only one a/r or a/p account allowed per transaction.

 This routine works great for all previous customers.  Maybe there is a setting in Quick Books that needs to be changed?

Thanks for your time,

Dennis