You can use this customer enhancement to activate your own function code for the processing and display transactions of the notifications, (service, maintenance and quality notifications). You can use these codes, for example, to call a customer-specific view for the task.
These function codes are in the menu under Goto -> Tasks
Function/Program:

• SAPLCLM01+U10: No description
• SAPLCLM01+U11: No description
• SAPLCLM01+US3: No description
• SAPLICUA+U10: No description
• SAPLICUA+U11: No description
• SAPLICUA+U12: No description
• SAPLICUA+U13: No description
• SAPLICUA+US3: Customer data for task
• SAPLICUA+US4: Customer data for task
• SAPLQGN01+U10: No description
• SAPLQGN01+U11: No description
• SAPLQGN01+U12: No description
• SAPLQGN01+U13: No description
• SAPLQGN01+US3: No description
• SAPLQGN01+US4: No description
• SAPLQM00+U10: No description
• SAPLQM00+U11: No description
• SAPLQM00+U12: No description
• SAPLQM00+U13: No description
• SAPLQM00+US3: Test User-Exit QM
• SAPLQM00+US4: Customer data for task
• SAPMIWO0+U10: No description
• SAPMIWO0+U11: No description
• SAPMIWO0+U12: No description
• SAPMIWO0+U13: No description
• SAPMIWO0+US3: Customer data for task
• SAPMIWO0+US4: Customer data for task
• EXIT_SAPLIQS0_003: Function Code "+US3/4" in Menu "Goto/Task" in Notification Processing
• EXIT_SAPLIQS0_008: Supply Function Codes with Text/ Deactivate Codes: "Goto/Task"