Here we would like to draw your attention to SU01D transaction code in SAP. As we know it is being used in the SAP BC-SEC (Security in Basis) component which is coming under BC module (BASIS).SU01D is a transaction code used for User Display in SAP.
It comes under the package SUSR.When we execute this transaction code, SAPMSUU0D is the normal standard SAP program that is being executed in background.
SAP SU01D menu path
See the possible menu paths to access the same report by avoiding entering the transaction code.
Tools → Administration → User Maintenance → Display Users
Transaction SU01D technical data table