Dirk requested the Sales Order number information in the FBL5N Customer line items report.
Donato has set up an SD copy control for the Billing type YF21 that enters the Sales Order number automatically into the FI document header field Reference.
(The FI document line item field Assignment was not changed and will continuously provide the information of the Sales Invoice number.)
The solution is in CEI235 now.
In our example document the Reference field includes the Sales Order number: