BOM INCORRECT AND PRODUCTION ORDER CONFIRMED AND INVOICED

HI all - please assist

Production job done with incorrect BOM - confirmation done and invoice raised to client. This mistake happened on a number of occasions over the course of a few months. We cannot reverse anything at this time since it is too long ago. Is there any way the missing material can be added on the old production jobs so that the stock is deducted out of SAP?

We would prefer not to do an adjustment as this reflects badly on the warehouse margins.