Most of the fleet users want to create work order and/or notification with reference to well-known external fleet numbers like license number, fleet object number or VIN rather than to use auto-generated SAP Equipment number.
Following configuration is available in standard SAP PM to cater this requirement.
After doing the necessary configuration, O150 scenario needs to be setup as default value in work order and notification for the fleet users.
Work Order Screen after settings
Notification Screen after settings