login LMT of SBC then:
1. Choose Maintenance > SE1000 > User Message Trace.
2. Double-click UserInterface. (In the User Message Trace dialog box, check whether Log is available under Combination. If unavailable, press Ctrl+Shift+F12 and then double-click UserInterface. Go to 3 only when Log is available.)
3. Enter an IMPU in the IMPU text box.
4. Select a path for saving files.
5. Click OK.
