Description
See http://svn.haxx.se/dev/archive-2009-11/0713.shtml When recursively copying a folder A/B to folder A/C within the same working copy, and A/B contains a file external, Subversion apparently tries to access the URL of target of the file external in the repository. Since a file external does not actually exist in the repository (it only exists in its svn:externals property representation), the copy fails.