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Users are able to select a "Many to Many" relationship from the Data Modeling Properties panel, even though Many to Many is not supported in Report Server and not available from the Edit Relationship box. If a user selects "Many to Many" from the Properties panel, saves and closes their file, they will not be able to open their file again.
Properties Panel where Many to Many is available for selection:
Edit Relationship box where Many to Many is not available for selection:
Error Message when the user attempts to open a file in which they've saved a Many to Many relationship:
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