SAP Message WS589 - Docs with invoice no. &1 and doc. date &2 avail. for invoicing party &3

System Response The system alerts you to a possible double entry of the same invoicedocument and therefore to a possible double payment. Since the invoicenumber is taken, the invoice document is entered by way of an eSOAService (InvoiceRequest_In). Procedure The current document can be posted despite this message. To avoid adouble entry: Check if the current document has already been recorded in the system.