Toplink-Map disappeared in Applications Navigator

Hi,
I can no longer find the toplinkmap in the applications navigator. This presumably happened when i changed the database connection in the sessions.xml from a native connection to a j2ee-datasource. The *.mwp-File is physically still there, 'Search in Files' also finds occurences of strings in it, but when double-clicking the according resultitem only a pane with a close-icon shows up. So for some reason jDeveloper ignores the presence of the toplink map. The application itself works fine, but i can no longer inspect or change the toplink map, e.g. can not add/remove queries to/from it.
Any idea someone? Thanks,
Magnus

I fixed it myself by comparing the content of the jpr-File with that one of a 'working' Project.

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