I progressed a little, now the session is in "Closing Control". I suspect the problem spurs from the fact that the POS session statement journal differs from the payment method journal used for the orders, how can I force the statement journal to the correct value? The correct payment method has id 1, currently the statement is set to the journal with ID 3. kindly see code below obtained when clicking on "Close Session & Post Entries" :

Traceback (most recent call last):
File "/odoo/odoo-server/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
result = request.dispatch()
File "/odoo/odoo-server/odoo/http.py", line 687, in dispatch
result = self._call_function(**self.params)
File "/odoo/odoo-server/odoo/http.py", line 359, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/odoo/odoo-server/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/odoo/odoo-server/odoo/http.py", line 348, in checked_call
result = self.endpoint(*a, **kw)
File "/odoo/odoo-server/odoo/http.py", line 916, in __call__
return self.method(*args, **kw)
File "/odoo/odoo-server/odoo/http.py", line 535, in response_wrap
response = f(*args, **kw)
File "/odoo/odoo-server/addons/web/controllers/main.py", line 1351, in call_button
action = self._call_kw(model, method, args, kwargs)
File "/odoo/odoo-server/addons/web/controllers/main.py", line 1339, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/odoo/odoo-server/odoo/api.py", line 464, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/odoo/odoo-server/odoo/api.py", line 451, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 300, in action_pos_session_closing_control
return session.action_pos_session_validate(balancing_account, amount_to_balance, bank_payment_method_diffs)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 311, in action_pos_session_validate
return self.action_pos_session_close(balancing_account, amount_to_balance, bank_payment_method_diffs)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 319, in action_pos_session_close
return self._validate_session(balancing_account, amount_to_balance, bank_payment_method_diffs)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 337, in _validate_session
data = self.with_company(self.company_id)._create_account_move(balancing_account, amount_to_balance, bank_payment_method_diffs)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 655, in _create_account_move
data = self._create_cash_statement_lines_and_cash_move_lines(data)
File "/odoo/odoo-server/addons/point_of_sale/models/pos_session.py", line 992, in _create_cash_statement_lines_and_cash_move_lines
statement = statements_by_journal_id[payment_method.journal_id.id]
Exception

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

Traceback (most recent call last):
File "/odoo/odoo-server/odoo/http.py", line 643, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/odoo/odoo-server/odoo/http.py", line 301, in _handle_exception
raise exception.with_traceback(None) from new_cause
KeyError: 1