[FIX] account: Prevent erasing currency when changing the date

- Create a misc. journal entry.
- Add a foreign currency on the line.
- Change the date.
=> The currency is erased because the onchange works only for invoices.

X-original-commit: e0bb4134512ec252b66ecfe91ce259d8cdcffedf

addons/account/models/account_move.py

@@ -332,13 +332,15 @@ class AccountMove(models.Model):
 
     @api.onchange('date', 'currency_id')
     def _onchange_currency(self):
-        company_currency = self.company_id.currency_id
-        has_foreign_currency = self.currency_id and self.currency_id != company_currency
+        if self.is_invoice(include_receipts=True):
+            company_currency = self.company_id.currency_id
+            has_foreign_currency = self.currency_id and self.currency_id != company_currency
 
-        for line in self.line_ids:
-            new_currency = has_foreign_currency and self.currency_id
-            line.currency_id = new_currency
-            line._onchange_currency()
+            for line in self.line_ids:
+                new_currency = has_foreign_currency and self.currency_id
+                line.currency_id = new_currency
+
+        self.line_ids._onchange_currency()
         self._recompute_dynamic_lines()
 
     @api.onchange('invoice_payment_ref')

addons/account/tests/test_account_move_entry.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 from odoo.addons.account.tests.common import AccountTestInvoicingCommon
 from odoo.tests import tagged, new_test_user
+from odoo.tests.common import Form
 from odoo import fields
 from odoo.exceptions import ValidationError, UserError
 
@@ -336,3 +337,66 @@ class TestAccountMove(AccountTestInvoicingCommon):
 
         move.post()
         self.assertEqual(move.message_partner_ids, self.env.user.partner_id | existing_partners | partner | commercial_partner)
+
+    def test_misc_move_onchange(self):
+        ''' Test the behavior on onchanges for account.move having 'entry' as type. '''
+
+        move_form = Form(self.env['account.move'])
+        # Rate 1:3
+        move_form.date = fields.Date.from_string('2016-01-01')
+
+        # New line that should get 400.0 as debit.
+        with move_form.line_ids.new() as line_form:
+            line_form.name = 'debit_line'
+            line_form.account_id = self.company_data['default_account_revenue']
+            line_form.currency_id = self.currency_data['currency']
+            line_form.amount_currency = 1200.0
+
+        # New line that should get 400.0 as credit.
+        with move_form.line_ids.new() as line_form:
+            line_form.name = 'credit_line'
+            line_form.account_id = self.company_data['default_account_revenue']
+            line_form.currency_id = self.currency_data['currency']
+            line_form.amount_currency = -1200.0
+        move = move_form.save()
+
+        self.assertRecordValues(
+            move.line_ids.sorted('debit'),
+            [
+                {
+                    'currency_id': self.currency_data['currency'].id,
+                    'amount_currency': -1200.0,
+                    'debit': 0.0,
+                    'credit': 400.0,
+                },
+                {
+                    'currency_id': self.currency_data['currency'].id,
+                    'amount_currency': 1200.0,
+                    'debit': 400.0,
+                    'credit': 0.0,
+                },
+            ],
+        )
+
+        # === Change the date to change the currency conversion's rate ===
+
+        with Form(move) as move_form:
+            move_form.date = fields.Date.from_string('2017-01-01')
+
+        self.assertRecordValues(
+            move.line_ids.sorted('debit'),
+            [
+                {
+                    'currency_id': self.currency_data['currency'].id,
+                    'amount_currency': -1200.0,
+                    'debit': 0.0,
+                    'credit': 600.0,
+                },
+                {
+                    'currency_id': self.currency_data['currency'].id,
+                    'amount_currency': 1200.0,
+                    'debit': 600.0,
+                    'credit': 0.0,
+                },
+            ],
+        )