I have added a new function to register a batch payment. When I am pressing it, its giving me the following error: 

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/odoo/http.py", line 654, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/odoo/http.py", line 301, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: Expected singleton: account.payment(29747, 29748, 29749, 29750, 29751)

This is the code:

def action_register_payment(self):
        _logger.info(f'\n\n\n  START \n\n\n.')
        action = self.mapped('slip_ids').action_register_payment()
        _logger.info(f'\n\n\n  Action {action}\n\n\n.')
        payments = self.env['account.payment'].browse(action['res_ids'])
        _logger.info(f'\n\n\n PAYMENT {payments}\n\n\n.')
        batch_action = payments.with_context(payment_date = self.date_end).create_batch_payment()
        _logger.info(f'\n\n\n   batch_action {batch_action}\n\n\n.')
        edit = self.write({'batch_payment_id': batch_action['res_id']})
        _logger.info(f'\n\n\n EDit {edit}\n\n\n.')
        
        return batch_action


On Odoo version 13 its working fine, but on Version 15 its not