Business Object Scope
The lifespan of a Business Object is typically bounded by the Process Instance in which it is created. This is called Process Local Scope.
It is possible in a service task to write information out to, or read from, a database. The structure of the database table might match one of the normal BOM classes, or the data in one of the normal BOM classes might have to be mapped into a Business Object that matches the database table structure depending on the implementation.