Here we would like to draw your attention to CMP_REASON transaction code in SAP. As we know it is being used in the SAP SD-BIL (Billing in SD) component which is coming under SD module (Sales & Distribution).CMP_REASON is a transaction code used for Customizing for Complaints Reasons in SAP.
It comes under the package CMP.
Transaction CMP_REASON technical data table
|Purpose||Customizing for Complaints Reasons|