AssertionError: 
Install without migration failed ::
 exceptions.AssertionError
 Unknown policy version_on_revert
 Traceback (most recent call last):
  File "/home/whit/dev/inst/ftesting/Products/OpenPlans/tests/test_ploneinstall.py", line 86, in test_openpage_migration
    install(self.portal, migrate_atdoc_to_openpage=False)
  File "/home/whit/dev/inst/ftesting/Products/OpenPlans/Extensions/Install.py", line 556, in install
    setupVersioning(portal, out)
  File "/home/whit/dev/inst/ftesting/Products/OpenPlans/Extensions/Install.py", line 336, in setupVersioning
    'version_on_revert')
  File "/home/whit/dev/inst/ftesting/Products/CMFEditions/CopyModifyMergeRepositoryTool.py", line 139, in addPolicyForContentType
    assert self._policy_defs.has_key(policy_id), "Unknown policy %s"%policy_id
AssertionError: Unknown policy version_on_revert