In Asset and configuration management, I've created a custom Object Schema. I am trying to select objects from a different Object Schema, but it is locked, and I unable to select it as it is a System-defined schema.
In the screenshot below, I've created the Document Management System custom object schema, within it I've created some objects and would like to reference some objects from the Services schema but there's no option.
Is there a way to do this or it is just a limitation?