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When merging an Entity with CascadeType.MERGE on a relationship which has a MapKeyJoinColumn the keys of the map are not merged. The specification requires that all Entities referenced by a relationship that is CascadeType.MERGE be merged.
Created attachment 196042 [details] Testcase that reproduces the issue The issue occurs because the merge is not cascaded to the key
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When this bug is fixed changes will need to be made along the lines of bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=302293 that updates merged collection changesets.
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