Prevent changing the company currency with account moves

issue10259
review361591005

__init__.py

@@ -4,6 +4,7 @@
 from trytond.pool import Pool
 from . import account
 from . import configuration
+from . import company
 from . import fiscalyear
 from . import journal
 from . import move
@@ -17,6 +18,7 @@ def register():
     Pool.register(
         fiscalyear.FiscalYear,
         fiscalyear.BalanceNonDeferralStart,
+        company.Company,
         account.TypeTemplate,
         account.Type,
         account.AccountTemplate,

company.py

@@ -0,0 +1,30 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from trytond.i18n import gettext
+from trytond.model.exceptions import AccessError
+from trytond.pool import PoolMeta, Pool
+from trytond.transaction import Transaction
+
+
+class Company(metaclass=PoolMeta):
+    __name__ = 'company.company'
+
+    @classmethod
+    def write(cls, *args):
+        pool = Pool()
+        Move = pool.get('account.move')
+        transaction = Transaction()
+        if (transaction.user
+                and transaction.context.get('_check_access')):
+            actions = iter(args)
+            for companies, values in zip(actions, actions):
+                if 'currency' in values:
+                    moves = Move.search([
+                            ('company', 'in', [c.id for c in companies]),
+                            ],
+                        limit=1, order=[])
+                    if moves:
+                        raise AccessError(gettext(
+                                'account.msg_company_change_currency'))
+
+        super().write(*args)

message.xml

@@ -193,5 +193,8 @@ You may need to cancel its move "%(move)s".</field>
         <record model="ir.message" id="msg_cancel_line_delegated">
             <field name="text">The moves "%(moves)s" contain grouped lines, cancelling them will ungroup the lines.</field>
         </record>
+        <record model="ir.message" id="msg_company_change_currency">
+            <field name="text">You cannot change the currency of a company which is associated with account moves.</field>
+        </record>
     </data>
 </tryton>