Invoice Matching

I have the following requirement:
A SAW shipment is created. The shipment has several stops and reference numbers.
E.g. shipment with stop A, B, C, D has reference number X, Y
1 invoice with reference number X has stops A, B
2 invoice with reference number Y has stops A, C, D

A is the pickup stop. B,C,D is the delivery stop

Does anyone have any idea how I can match the invoices to the shipments in this case? In addition, the invoice amount would in any case differ from the total costs of the shipment as I have 2 invoices for 1 shipment.