feat: add dlv_account_reconciliation_rest_amount — show rest amount on bank reconciliation screen

dlv_account_reconciliation_rest_amount/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2026-08-10
+
+### Added
+- Initial release.
+- Show the rest (still open) amount in parentheses on the bank
+  reconciliation screen, for both the bank movement line and any partially
+  used added invoice/bill line.

dlv_account_reconciliation_rest_amount/README.md

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+# dlv_account_reconciliation_rest_amount
+
+## Overview
+
+`dlv_account_reconciliation_rest_amount` extends the standard bank
+reconciliation screen (Accounting → Reconciliation) so the still-open
+("rest") amount of a line is shown in parentheses next to its total.
+
+On the reconciliation screen, when a proposed line (the bank movement itself,
+or an added invoice/bill) is only partially used to close the statement line,
+Odoo shows the full amount struck through and the partial amount used above
+it — but not what remains unmatched on that line. This addon adds that
+missing number, e.g.:
+
+```
+€ 1.899,97
+€ 4.486,35   (€ 2.586,38)
+```
+
+so the user immediately sees that €2.586,38 of that invoice is still
+outstanding, without having to search for it elsewhere.
+
+## How it works
+
+- `static/src/js/reconciliation_rest_amount.js` patches
+  `account.ReconciliationRenderer`'s `ManualLineRenderer.update()`. Before
+  every render, it walks `state.reconciliation_proposition` and, for any line
+  where `partial_amount` differs from `amount`, computes and formats the
+  difference as `line.rest_amount_str`.
+- `static/src/xml/reconciliation_rest_amount.xml` inherits the shared
+  `reconciliation.line.mv_line.amount` template (from `account_accountant`)
+  via xpath and prints `line.rest_amount_str` between parentheses, right
+  after the existing amount.
+
+Because both the bank movement (liquidity line) and any added invoice/bill
+proposition are rendered through the same loop and template, this single
+patch covers both cases.
+
+## Dependencies
+
+- `account_accountant`
+
+## Installation
+
+Standard addon install/update. No configuration or data is added; the change
+is purely visual on the existing reconciliation widget.

dlv_account_reconciliation_rest_amount/ROADMAP.md

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+# Roadmap
+
+Planned extensions to the reconciliation rest-amount addon. Items are grouped
+by target release and are subject to change.
+
+## v1.1 — Suggest matching entries by rest amount
+
+- When a line's rest amount matches (exactly, or within a small tolerance)
+  another open entry for the same partner, surface it as a suggested match
+  in the "Match with existing entries" tab instead of requiring the user to
+  find it manually.
+
+## Future — Configurable tolerance / rounding
+
+- Allow a small configurable rounding tolerance when comparing rest amounts,
+  to account for currency rounding differences.

dlv_account_reconciliation_rest_amount/__manifest__.py

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+# -*- coding: utf-8 -*-
+{
+    "name": "Reconciliation Rest Amount",
+    "summary": "Toon het restbedrag tussen haakjes op het afletterscherm "
+               "(bank reconciliatie)",
+    "description": """
+Voegt het restbedrag (verschil tussen het oorspronkelijke bedrag en het reeds
+afgeletterde/toegewezen bedrag) tussen haakjes toe aan het bank-afletterscherm,
+zowel bij de regel van het bankafschrift (liquidity-line) als bij de
+voorgestelde afletteringsregels (bestaande boekingen) die niet volledig
+worden ingezet.
+""",
+    "author": "bv Domus La Vila",
+    "website": "https://domuslavila.eu",
+    "category": "Accounting/Accounting",
+    "version": "16.0.1.0.0",
+    "license": "LGPL-3",
+    "depends": ["account_accountant"],
+    "data": [],
+    "assets": {
+        "web.assets_backend": [
+            "dlv_account_reconciliation_rest_amount/static/src/js/*.js",
+            "dlv_account_reconciliation_rest_amount/static/src/xml/*.xml",
+        ],
+    },
+    "installable": True,
+    "application": False,
+    "auto_install": False,
+}

dlv_account_reconciliation_rest_amount/static/src/js/reconciliation_rest_amount.js

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+odoo.define('dlv_account_reconciliation_rest_amount.reconciliation_renderer', function (require) {
+"use strict";
+
+/**
+ * Toont het restbedrag (het verschil tussen het volledige bedrag van een
+ * regel en het bedrag dat effectief wordt ingezet om af te letteren) tussen
+ * haakjes op het afletterscherm.
+ *
+ * Dit geldt zowel voor de bankbeweging zelf (de liquidity-line) als voor een
+ * toegevoegde boeking (bv. een aankoopfactuur) waarvan niet het volledige
+ * bedrag wordt gebruikt (line.partial_amount != line.amount).
+ */
+
+var ReconciliationRenderer = require('account.ReconciliationRenderer');
+var field_utils = require('web.field_utils');
+
+ReconciliationRenderer.ManualLineRenderer.include({
+
+    /**
+     * @override
+     */
+    update: function (state) {
+        this._computeRestAmounts(state);
+        return this._super.apply(this, arguments);
+    },
+
+    /**
+     * Berekent, voor elke regel in de afletteringsvoorstellen die slechts
+     * gedeeltelijk wordt ingezet, het nog resterende (niet-afgeletterde)
+     * bedrag en formatteert dit als rest_amount_str.
+     *
+     * @private
+     * @param {Object} state
+     */
+    _computeRestAmounts: function (state) {
+        var format_options = {currency_id: state.st_line.currency_id};
+        _.each(state.reconciliation_proposition, function (line) {
+            if (!line) {
+                return;
+            }
+            var hasPartialAmount = line.partial_amount && Math.abs(line.partial_amount) !== Math.abs(line.amount);
+            if (hasPartialAmount) {
+                var rest = Math.abs(line.amount) - Math.abs(line.partial_amount);
+                line.rest_amount = rest;
+                line.rest_amount_str = field_utils.format.monetary(rest, {}, format_options);
+            } else {
+                delete line.rest_amount;
+                delete line.rest_amount_str;
+            }
+        });
+    },
+
+});
+
+});

dlv_account_reconciliation_rest_amount/static/src/xml/reconciliation_rest_amount.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <!--
+        Voegt het restbedrag (line.rest_amount_str, berekend in
+        reconciliation_rest_amount.js) tussen haakjes toe naast het bedrag
+        van een afletteringsregel. Geldt zowel voor de bankbeweging
+        (liquidity-line) als voor een toegevoegde boeking waarvan niet het
+        volledige bedrag wordt ingezet.
+
+        Origineel template: reconciliation.line.mv_line.amount
+        (enterprise-sys/account_accountant/static/src/xml/account_reconciliation.xml)
+    -->
+    <xpath expr="//t[@t-name='reconciliation.line.mv_line.amount']//span[hasclass('line_amount')][2]" position="after">
+        <span t-if="line.rest_amount_str" class="dlv_rest_amount text-muted" title="Nog te matchen"> (<t t-out="line.rest_amount_str"/>)</span>
+    </xpath>
+
+</templates>