[1.8] Odd error on makemigrations when moving model to another application

Traceback first:

./manage.py makemigrations

Traceback (most recent call last):

  File "./manage.py", line 10, in <module>

    execute_from_command_line(sys.argv)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 351, in execute_from_command_line

    utility.execute()

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 343, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/core/management/base.py", line 394, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/core/management/base.py", line 445, in execute

    output = self.handle(*args, **options)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 125, in handle

    migration_name=self.migration_name,

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 43, in changes

    changes = self._detect_changes(convert_apps, graph)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 110, in _detect_changes

    self.old_apps = self.from_state.concrete_apps

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 170, in concrete_apps

    self.apps = StateApps(self.real_apps, self.models, ignore_swappable=True)

  File "/home/me/.virtualenvs/fluent/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 248, in __init__

    raise ValueError(msg.format(field=operations[0][1], model=lookup_model))

ValueError: Lookup failed for model referenced by field sdd.Documentation.opportunity: sdd.......governance.models.Opportunity

Needless to say, sdd.......governance.models.Opportunity is not a valid path to anything.

The Opportunity model was moved from the sdd application to the governance application. Documentation has a foreign key to Opportunity. The Python itself is correct. It used to be a direct reference to the class in the module, now it's an imported reference. All of the foreign keys are handled in the same way. Nothing is done by string.

I'm ok with a one-off solution for the migration, but I'm more interested in why the model path is so far off and what I might have done to cause it.

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