Not sure about that. If I add another revision to the subversion repository that modifies branches/1.0/dir1/file.txt, I get the error message:
bzr: ERROR: Unable to find file id for child 'file.txt' in 'dir1' in <RevisionMetadata for revision 5, path branches/1.0 in repository '67e5a9f3-fd31-4ac5-b9e1-8972478448c8'>.
Not sure about that. If I add another revision to the subversion repository that modifies branches/ 1.0/dir1/ file.txt, I get the error message:
bzr: ERROR: Unable to find file id for child 'file.txt' in 'dir1' in <RevisionMetadata for revision 5, path branches/1.0 in repository '67e5a9f3- fd31-4ac5- b9e1-8972478448 c8'>.
bug 308353 appears to deal with a different bug.