Some invoices exported from MRM have ended up duplicated in QB. These duplicate invoices were exactly the same, including the invoice number. How does this happen?

 

The way the MRM-QB link normally works, when you try to create a new invoice in QB and that invoice no already exists in QB, the import fails and an error message is generated. The only reason there would be any duplicates is if they manually set the transferred status to not transferred after it was exported to QB (if they needed to  edit it) and did not reset to transferred.

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