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I used "Team/Relocate..." to relocate a parent Maven project that is versioned by Subversion. When I right click on the project after relocation is finished the "Subversion" menu item is gone, instead there is the "Versioning" item that is shown for unversioned projects. If I select this item I see that "Import into Subversion Repository..." is grayed out. This problem doesn't appear on the maven child projects. The described problem seems to dissappear after restarting Netbeans so I don't think that this bug is very critical.
I tried, but no success in reproducing your scenario. Could you please try once more? Are you able to reproduce?