[FIX] account: currency of reconci. suggestion

When the currency used for a payment/internal transfert is not the same
as the company currency, the prices shown in the reconciliation
suggestions are computed using the company currency.

1) Enable multi-currency.
2) Setup two bank, one in USD, the other in EUR.
3) Leave the company currency to USD.
4) Create an invoice for a partner targeting the EUR bank and
   validate it.
5) Create a bank statement for the EUR bank amounting the **exact**
   value of the invoice for the **same** partner and reconcile it,
   this will create the payment behind the hood.
6) In the reconciliation the invoice appears as suggestion, if the
   currency symbol is correct, the amount is shown as USD.

opw-1937202

closes #30623

closes odoo/odoo#31290

addons/account/models/reconciliation_widget.py

@@ -135,11 +135,12 @@ class AccountReconciliation(models.AbstractModel):
             else:
                 aml_ids = matching_amls[line.id]['aml_ids']
                 bank_statements_left += line.statement_id
+                target_currency = line.currency_id or line.journal_id.currency_id or line.journal_id.company_id.currency_id
 
                 amls = aml_ids and self.env['account.move.line'].browse(aml_ids)
                 line_vals = {
                     'st_line': self._get_statement_line(line),
-                    'reconciliation_proposition': aml_ids and self._prepare_move_lines(amls) or [],
+                    'reconciliation_proposition': aml_ids and self._prepare_move_lines(amls, target_currency=target_currency, target_date=line.date) or [],
                     'model_id': matching_amls[line.id].get('model') and matching_amls[line.id]['model'].id,
                     'write_off': matching_amls[line.id].get('status') == 'write_off',
                 }

addons/account/tests/test_reconciliation_widget.py

 import logging
 import odoo.tests
 import time
+from odoo.addons.account.tests.test_reconciliation import TestReconciliation
 
 _logger = logging.getLogger(__name__)
 
@@ -22,3 +23,29 @@ class TestUi(odoo.tests.HttpCase):
         self.phantom_js("/web#statement_ids=" + str(bank_stmt.id) + "&action=bank_statement_reconciliation_view",
             "odoo.__DEBUG__.services['web_tour.tour'].run('bank_statement_reconciliation')",
             "odoo.__DEBUG__.services['web_tour.tour'].tours.bank_statement_reconciliation.ready", login="admin")
+
+
+@odoo.tests.tagged('post_install', '-at_install')
+class TestReconciliationWidget(TestReconciliation):
+
+    def test_statement_suggestion_other_currency(self):
+        # company currency is EUR
+        # payment in USD
+        invoice = self.create_invoice(invoice_amount=50, currency_id=self.currency_usd_id)
+
+        # journal currency in USD
+        bank_stmt = self.acc_bank_stmt_model.create({
+            'journal_id': self.bank_journal_usd.id,
+            'date': time.strftime('%Y-07-15'),
+            'name': 'payment %s' % invoice.number,
+        })
+
+        bank_stmt_line = self.acc_bank_stmt_line_model.create({'name': 'payment',
+            'statement_id': bank_stmt.id,
+            'partner_id': self.partner_agrolait_id,
+            'amount': 50,
+            'date': time.strftime('%Y-07-15'),
+        })
+
+        result = self.env['account.reconciliation.widget'].get_bank_statement_line_data(bank_stmt_line.ids)
+        self.assertEqual(result['lines'][0]['reconciliation_proposition'][0]['amount_str'], '$ 50.00')
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