In my case i was not able to get the details through USR03 table and using FM "BAPI_USER_GET_DETAIL" I was not able to pass list of userid, thus i found another way to get the details, i.e., via T-code SUIM. Go to T-code: SUIM -> User Information System -> User -> Users by complex selection criteria -> By UserID. Once you pass list of userid's then execute then you can see the long name of the user.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.