Based on all the deliveries made in a day, the system generates an Intercompany invoice from the delivering company to the selling company. This billing document is taken as reference to create an FI vendor invoice via IDOC in the selling company.
When the billing document has more than 950 lines, the vendor invoice is split into two. But both the invoices have the same "Original Vendor Invoice" number i.e. the billing document number.
This is now causing an issue with SII