Invoice creation-Billing block doubt

Hi,

I have a scenario where the sold-to party & ship-to party is ABC and bill-to party & payer is XYZ.

Sold-to party is blocked from creating invoices in XD05. (Billing block). Bill-to party and Payer doesn't have any block.

When I try to create invoice for a contract which is having above scenario, I am getting error "Document is blocked for billing" (Contract doesn't have any blocks)

I know that if we set billing block for customer in XD05, he will not be able to create any invoices. But Bill-to/Payer doesn't have any block. So SAP doesn't consider this point when blocking customer for invoicing.

Thanks,

Dattatreya N R