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This structure represents the unique key fields associated with identifying an a Invoice .  Invoices Invoice s can be identified by InvoiceNumber or InvoiceUid. When specifying an PwsInvoiceRef as a PwsInvoiceRef as an input to a web service, you may specify one or both the InvoiceNumber and/or InvoiceUid. However, if you do specify both, they must both refer to the same Client Invoice  or the Client Reference Invoice reference will not be considered valid. When a PwsClientRef is PwsInvoiceRef is returned in the response to a web service, both the ClientUid InvoiceNumber and ClientNumber InvoiceUid will be populated, and guaranteed to refer to a single ClientInvoice.

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