Comment 1 for bug 141456

After some testing I need to correct this:

The error "Already in a write group" seems to be a general error in 0.90.1 when working with subtrees.
I get it anytime I work with subtrees that are joined by reference... This seems to be a separate bug.

I only upgraded to the new version in the hope that merging will work there. Before I worked with 0.15.0 ubuntu.

The error message I get there is following:
bzr: ERROR: exceptions.AssertionError:

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 650, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 612, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 304, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 2118, in run
    reporter=reporter)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree_4.py", line 244, in commit
    result = WorkingTree3.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/mutabletree.py", line 160, in commit
    revprops=revprops, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commit.py", line 319, in commit
    self._populate_new_inv()
  File "/usr/lib/python2.5/site-packages/bzrlib/commit.py", line 656, in _populate_new_inv
    path, self.work_tree)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 2089, in record_entry_contents
    self.repository.get_transaction())
  File "/usr/lib/python2.5/site-packages/bzrlib/inventory.py", line 211, in find_previous_heads
    assert candidates[ie.revision] == ie
AssertionError