Here we would like to draw your attention to OIAC transaction code in SAP. As we know it is being used in the SAP PM (Plant Maintenance) module. OIAC is a transaction code used for Matchcode notifications in SAP.
It comes under the package INSC.When we execute this transaction code, SAPMSD20 is the normal standard SAP program that is being executed in background.
Transaction OIAC technical data table