[ADD] new module pos_cash_control_multiple_config to handle correctly cash control in a multi point of sale context

pos_cash_control_multiple_config/README.rst

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+=======================================
+Point Of Sale - Correct Opening Balance
+=======================================
+
+.. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

pos_cash_control_multiple_config/__init__.py

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+from . import models

pos_cash_control_multiple_config/__manifest__.py

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+# Copyright (C) 2020 - Today: GRAP (http://www.grap.coop)
+# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+{
+    "name": "Point Of Sale - Correct Opening Balance",
+    "summary": "Handle correctly opening balance in a multi point of sale"
+    " context with Cash control enabled.",
+    "version": "12.0.1.0.1",
+    "category": "Point of Sale",
+    "author": "GRAP, Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/pos",
+    "license": "AGPL-3",
+    "depends": [
+        "point_of_sale",
+    ],
+    "installable": True,
+}

pos_cash_control_multiple_config/models/__init__.py

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+from . import account_bank_statement
+from . import pos_session

pos_cash_control_multiple_config/models/account_bank_statement.py

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+# Copyright (C) 2020 - Today: GRAP (http://www.grap.coop)
+# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, models
+
+
+class AccountBankStatement(models.Model):
+    _inherit = "account.bank.statement"
+
+    @api.multi
+    def _get_opening_balance(self, journal_id):
+        PosSession = self.env["pos.session"]
+        pos_config_id = self.env.context.get("pos_config_id")
+        if pos_config_id:
+            sessions = PosSession.search(
+                [('config_id', '=', pos_config_id)],
+                order="start_at desc", limit=1)
+            if not sessions:
+                # it is the first time the pos config is opened.
+                # returning 0
+                return 0
+            else:
+                last_valid_statement = False
+                for old_statement in sessions.mapped('statement_ids'):
+                    if old_statement.journal_id.id == journal_id:
+                        last_valid_statement = old_statement
+                if last_valid_statement:
+                    return last_valid_statement.balance_end_real
+
+        return super()._get_opening_balance(journal_id)

pos_cash_control_multiple_config/models/pos_session.py

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+# Copyright (C) 2020 - Today: GRAP (http://www.grap.coop)
+# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, models
+
+
+class PosSession(models.Model):
+    _inherit = "pos.session"
+
+    @api.model
+    def create(self, values):
+        pos_config_id = values.get('config_id')\
+            or self.env.context.get('default_config_id')
+        return super(PosSession, self.with_context(
+            pos_config_id=pos_config_id)).create(values)

pos_cash_control_multiple_config/readme/CONTRIBUTORS.rst

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+* Sylvain LE GAL <https://twitter.com/legalsylvain>

pos_cash_control_multiple_config/readme/DESCRIPTION.rst

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+This module extends the functionality of the point of sale fixing
+cash control in a multi pos config context.
+
+By default, in Odoo, if we have two Point of Sale (``pos.config``) with cash control
+enabled on each Point of sale, the opening balance will be bad, when opening many
+session.
+
+This module fixes that bug.
+
+Ref :
+
+https://github.com/odoo/odoo/issues/62147