We are uploading invoice header/details to Sage 100 ERP 2013 using the AR_Invoice_Bus from Visual Studio 2013 under .NET Framework 4.0.  Many of the invoices we upload go successfully, but some encounter this error:

"You cannot use a credit card payment when the A/R Option Allow Credit Card Entry is not selected"

But the invoices that we are uploading have no payments or have any identifiable connection to credit cards whatsoever.

We have looked at every option we can think of at the Company, Customer, Item Maintenance, GL Account Maintenance, and actual invoice levels to try to identify a possible difference between the invoices that are allowed and the ones that are not.  We are uploading "standard" invoices, mostly with 1 or 2 line items, all of which are under Miscellaneous Item Maintenance.  We use the default customer payment terms.  The Allow Credit Cards option under the AR Options is not checked (intentionally), but this shouldn't matter since some invoices are being uploaded successfully.

Any ideas?