Here we would like to draw your attention to VOVN transaction code in SAP. As we know it is being used in the SAP SD-SLS (Sales in SD) component which is coming under SD module (Sales & Distribution).VOVN is a transaction code used for Assignment Rules/Cancellation Proc. in SAP.
It comes under the package VA0C.
Transaction VOVN technical data table
|Purpose||Assignment Rules/Cancellation Proc.|