You assign the role /AIF/KEY_USER to users that are responsible for extended error handling. This role is recommended for users who have to carry out critical error handling operations that are not allowed for normal error handling as with the role /AIF/BUSINESS_USER. In addition to the authorizations of the role /AIF/BUSINESS_USER, this role includes the authorization to make error corrections in emergency mode. Additionally, the users can run the Process Interface Data report, generate and display message snapshots, and display log messages in the application log raised by the SAP Application Interface Framework.