Here we would like to draw your attention to SRMCUSTSRV transaction code in SAP. As we know it is being used in the SAP BC-SRV (Basis Services / Communication Interfaces in Basis) component which is coming under BC module (BASIS).SRMCUSTSRV is a transaction code used for SRM: Maintain Custom Services in SAP.
It comes under the package SRM_CLIENTFRAME_WIN.
Transaction SRMCUSTSRV technical data table
|Purpose||SRM: Maintain Custom Services|