Hey.

I have created DebtorPayment CashBook where I want to register all the payments for "Manual Customer Invoices"(from another CashBook).
When I'm calling CashBookEntry_SetDebtorInvoiceNumber, exception is being thrown "suds.WebFault: Server raised fault: 'Economic.Api.Exceptions.IntegrityException(E06300): The debtor invoice number must refer to either an invoice or a reminder. {id=1455260111}'"
All other CashBookEntry_Set* methods are working as expected.
This error message makes no sense to me, since I can input any non-existing invoice number in GUI and it works.