Hello
May be 2 ways you can do that
1) Maintain 0EMPLOYEE as authorisation relevant infoobject and make this field as input variable in the report. You wll have to maintain 0EMPLOYEE values for all the users.
2) Another way may be to make 0EMPLOYEE as non authorisation relevant. Create a customer exit variable , not input ready, but will fetch the user name from the ID from which the report is running. You can use the FM RSEC_GET_USERNAME to get the user name.
This will work only if your SAP ID and employee id are the same
Regards
Gajesh