Here we would like to draw your attention to VBKD transaction code in SAP. As we know it is being used in the SAP SD-BF (Basic Functions in SD) component which is coming under SD module (Sales & Distribution).VBKD is a transaction code used for Bonus Buy: Condition Types in SAP.
It comes under the package WCBBY.
Transaction VBKD technical data table
|Purpose||Bonus Buy: Condition Types|