SAP Message VY609 - Invoices exist for this shipment cost item

Diagnosis
Invoices for this shipment cost item have already been posted.

System Response
Value of service : &v1&
Posted invoices : &v2&
Open value : &v3&
Further postings can only be made as subsequent debits.

Procedure
During the invoice check, enter a subsequent debit indicator for everyaccount assignment line for this item.