Exception 'You try to upgrade a module that depends on the module

trying to run the migration script towards 6.0 I run into an exception:

Traceback (most recent call last):
  File "/opt/openupgrade/server/6.0/bin/openerp-server.py", line 121, in <module>
    db,pool = pooler.get_db_and_pool(dbname, update_module=tools.config['init'] or tools.config['update'], pooljobs=False)
  File "/opt/openupgrade/server/6.0/bin/pooler.py", line 39, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
  File "/opt/openupgrade/server/6.0/bin/addons/__init__.py", line 1000, in load_modules
    modobj.button_upgrade(cr, 1, ids)
  File "/opt/openupgrade/server/6.0/bin/addons/base/module/module.py", line 340, in button_upgrade
    raise orm.except_orm(_('Error'), _('You try to upgrade a module that depends on the module: %s.\nBut this module is not available in your system.') % (dep.name,))
osv.orm.except_orm: ('Error', u'You try to upgrade a module that depends on the module: report_analytic_planning.\nBut this module is not available in your system.')

In my database I have 'board_project' installed which depends on 'report_analytic_planning'.

Both of these modules seem not to be available anymore in 6.0.

Can you please give me some kind of advice on how to best tackle this problem?

Many thx and Greets,
Peter