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Created attachment 195575 [details] Test projects demonstrating the bug Take some module projects duplicating their parent's groupId and version. Apply quick fix to "GroupId is duplicate of parent groupId" and "Version is duplicate of parent version", the groupId and version are deleted as expected (you can check the pom.xml and then close it) Now if you update the project configuration of either the modules or their parent, the groupId and version are restored in the modules pom. Warning markers reappear. Deleting the groupId and version by hand fixes the issue. Seems a stale representation of the model is kept in memory, after the quickfix. You can check the issue by importing the attached projects.
Still effects 1.1.0 I dont believe the Quick Fix actually fixes the problem. It is probably updating the in memory copy. SVN status icons DO NOT change after applying the quick fix, and a Team > Sync shows the local copy is up to date. Manually removing the groupId fixes the warning AND if you then do Maven > Update Project... the groupId does not get incorrectly put back.
closing old/stale bugreport
Moved to https://github.com/eclipse-m2e/m2e-core/issues/