svnadmin create repo --compatible-version 1.7
svn mkdir -mm file://`pwd`/repo/A
svn cp -mm file://`pwd`/repo/A ^/B
svn mkdir -mm file://`pwd`/repo/C
svnmucc -mm -- propset svn:externals '-r1 ^/B X' file://`pwd`/repo/C
Checkout/update fails:
svn: warning: W205011: Error handling externals definition for 'wc/X':
svn: warning: W170000: URL 'file:///home/pm/sw/subversion/obj/repo/A' at
revision 1 doesn't exist
Checked out revision 4.
svn: E205011: Failure occurred processing one or more externals definitions
This checkout works with 1.8.