Cannot insert duplicate key row in object 'dbo.invoice' with unique index 'invoice_index01.'

FAQs > Error Messages > Cannot insert duplicate key row in object 'dbo.invoice' with unique index 'invoice_index01.'

When posting an invoice, you may encounter this error:

Cannot insert duplicate key row in object 'dbo.invoice' with unique index 'invoice_index01'
The duplicate key value is (XXXXXXXXX)

This error message means that more than one user is attempting to post the same invoice at the same time.