Here we would like to draw your attention to SCA4_U 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).SCA4_U is a transaction code used for Cannot be executed directly in SAP.
It comes under the package SZC.When we execute this transaction code, SZC_HOLIDAY_MAINTAIN is the normal standard SAP program that is being executed in background.
Transaction SCA4_U technical data table
|Purpose||Cannot be executed directly|