[14.0] POS_order_return error payment about pos HOT 8 CLOSED

Erreur:
Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo_14/server/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/home/odoo_14/server/odoo/http.py", line 685, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo_14/server/odoo/http.py", line 361, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo_14/server/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo_14/server/odoo/http.py", line 349, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo_14/server/odoo/http.py", line 908, in __call__
    return self.method(*args, **kw)
  File "/home/odoo_14/server/odoo/http.py", line 533, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo_14/server/addons/web/controllers/main.py", line 1376, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/home/odoo_14/server/addons/web/controllers/main.py", line 1364, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo_14/server/odoo/api.py", line 399, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/home/odoo_14/server/odoo/api.py", line 386, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/odoo_14/additionnal_repositories/OCA-pos/pos_customer_required/models/pos_make_payment.py", line 29, in check
    return super(PosMakePayment, self).check()
  File "/home/odoo_14/server/addons/point_of_sale/wizard/pos_payment.py", line 59, in check
    order._create_order_picking()
  File "/home/odoo_14/additionnal_repositories/OCA-pos/pos_order_return/models/pos_order.py", line 141, in _create_order_picking
    res = wizard.create_returns()
  File "/home/odoo_14/server/addons/stock/wizard/stock_picking_return.py", line 175, in create_returns
    new_picking_id, pick_type_id = wizard._create_returns()
  File "/home/odoo_14/server/addons/delivery/models/stock_picking.py", line 312, in _create_returns
    new_picking, pick_type_id = super(StockReturnPicking, self)._create_returns()
  File "/home/odoo_14/server/addons/stock_account/wizard/stock_picking_return.py", line 18, in _create_returns
    new_picking_id, pick_type_id = super(StockReturnPicking, self)._create_returns()
  File "/home/odoo_14/server/addons/stock/wizard/stock_picking_return.py", line 120, in _create_returns
    new_picking = self.picking_id.copy({
  File "/home/odoo_14/server/odoo/models.py", line 4691, in copy
    self.ensure_one()
  File "/home/odoo_14/server/odoo/models.py", line 5028, in ensure_one
    raise ValueError("Expected singleton: %s" % self)
Exception

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

Traceback (most recent call last):
  File "/home/odoo_14/server/odoo/http.py", line 641, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo_14/server/odoo/http.py", line 317, in _handle_exception
    raise exception.with_traceback(None) from new_cause
ValueError: Expected singleton: stock.picking()