N number of invoices from a single delivery

Hi SAP gurus,

Pl let me know why system is allowing to create N number of invoices from a single delivery with the same quantity.

The invoice is a proforma invoice (consignment fill up). Here system is allowing to create any number of invoices for a delivery.

I have checked the copy control for delivery to invoice. In the (KBN) Item data Billing Quanity is maintained as blank, so I have checked with C / D, which are for proforma invoice. But the same is happening. Can you tell me is there any other setting also has to be done.

Regards,

Sreehari.