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If you have a model "A" and rename it into "B", then import it via the file system option into another model C and set it as the called element of a CallActivity, the calledElement attribute is set as "ns:A". So instead of "ns:B", the old name is set here, whereas in the location of the import, the correct path with the new name ("something/something/something/B.bpmn") is set. Because of this, everytime you open model C, you get an UnresolvedReferenceException and the link from the CallActivity to model B is broken.
Maintaining referential integrity is not an easy task and I have been putting this off for a long time. See bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=383849.