def validate_pickings(self, pickings):
    """Method used to validate pickings no matter the number of steps used in the picking process
    """
    pick = pickings.filtered(lambda a: a.state in ('confirmed', 'assigned'))
    # Confirming Pick
    pick.action_confirm()
    pick.action_assign()
    value = self.trans.\
            with_context({'active_model': 'stock.picking',
                          'active_id': pick.id,
                          'active_ids': [pick.id]}).default_get([])
    line = []
    for ope in value.get('item_ids', []):
        line.append((0, 0, ope))

    value['item_ids'] = line
    value['picking_id'] = pick.id
    # Creating an object of the pack window
    trans_id = self.trans.create(value)
    # Validating wizard
    trans_id.do_detailed_transfer()
    self.assertEqual(pick.state, 'done', 'The pick was not validated')
    return pickings.filtered(lambda a: a.state in ('confirmed', 'assigned')) and validate_pickings(pickings) or pickings