Reference vs Code

Those are new sequences:

"Supplier Return Shipment Sequence"
"Supplier Shipment Sequence"
"Internal Shipment Sequence"
"Customer Return Shipment Sequence"
"Customer Shipment Sequence"
"Party Reference Sequence"
"Purchase Reference Sequence"
"Sale Reference Sequence"

What is the reason for the naming of some sequences with "Reference"?
I propose to drop Reference from the name.