In the wizard "Open Calling Partner", when you click on "open related orders" for example, it will open the orders with an explicit filter that you can then delete.
'''Returns the action that opens the list view of the 'oerp_object'
givenasargumentfilteredonthepartner'''
# This module only depends on "base"
@ -87,7 +88,13 @@ class wizard_open_calling_partner(orm.TransientModel):
raiseorm.except_orm(_('Error :'),_("The object '%s' is not found in your OpenERP database, probably because the related module is not installed."%oerp_object._description))