INV - Partial received shipment (ASN) is showed as Fully Received

Hi experts,

We have an issue with all the "Return Receipts".

After receiving the shipment (ASN), the receipt line is showing as "Fully received", which is correct, but after to perform a return, the line is still showing as "Fully received" instead of "Partial".

Example:

Shipment received = 100

Return = 20

Shipment line = 80

Shipment line shows as "Fully received"

Any suggestion on it?

Thanks

RC