Here we would like to draw your attention to OSC3 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).OSC3 is a transaction code used for Appointment Calendar:Priority Maint. in SAP.
It comes under the package SZTK.
Transaction OSC3 technical data table
|Purpose||Appointment Calendar:Priority Maint.|