mail.activity.type.form.inherit.calendar mail.activity.type 0 mail.activity.form.inherit.calendar mail.activity {'invisible': [('activity_category', '=', 'meeting')]} {'invisible': [('activity_category', '=', 'meeting')]} {'invisible': [('activity_category', '=', 'meeting')]} {'invisible': [('activity_category', '=', 'meeting')]} {'invisible': [('activity_category', '=', 'meeting')]}