You can obtain the source GUID from the header of the STEP file and use it to evaluate the mapping rules (including default value provisioning) by enabling a property. Enabling this property means that the collaboration source ID (lastKnownRepository value from the header section of the schema in the manifest) is read from the jar manifest instead of the in the MetadataMappingUtility application.

To enable this functionality you must set the wt.stepdex.create.manifest property in the stepdex.properties file to true (wt.stepdex.create.manifest=true). The property is set to false by default.