In copy control from sales documenty to billing document you can choose where the billing document takes the assignment number from. You can select, PO, sales doc number etc.
The field you need is the reference number. You can find that under SPRO, sales and distribution, billing, copy control, Copying control: Sales document to billing document. In the header settings you can choose the reference number. Select B for sales document number.
regards
Michalis Papadopoulos
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