When trying to tag a build to an existing tag I get this error:

Tagging http://PROJECT/trunk (rev.7) to http://PROJECT/tags/uat

Failed to tag
org.tmatesoft.svn.core.SVNException: svn: Path 'tags/uat' already exists
at
org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:55)
at
org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:40)
at org.tmatesoft.svn.core.wc.SVNCopyClient.doCopy(SVNCopyClient.java:312)
at
hudson.scm.SubversionTagAction$TagWorkerThread.perform(SubversionTagAction.java:167)
at hudson.model.TaskThread.run(TaskThread.java:77)
Completed

I would expect behaviour similar to the svn-tag plugin instead, where if the tag
already exists it is over-written (perhaps with a warning/confirmation first).