Here we would like to draw your attention to OIST transaction code in SAP. As we know it is being used in the SAP PM-EQM (Technical Objects in Plant Maintenance) component which is coming under PM module (Plant Maintenance).OIST is a transaction code used for Maintain Permit Categories in SAP.
It comes under the package ISPP.
Transaction OIST technical data table
|Purpose||Maintain Permit Categories|