Here we would like to draw your attention to APB_ISR_CUST transaction code in SAP. As we know it is being used in the SAP BC-MUS (Musing Tools in BC) component which is coming under BC module (BASIS).APB_ISR_CUST is a transaction code used for ISR Scenario Customizing in SAP.
It comes under the package APB_ISR.
Transaction APB_ISR_CUST technical data table
|Purpose||ISR Scenario Customizing|