diff --git a/addons/laundry_management/static/src/js/order_summary_patch.js b/addons/laundry_management/static/src/js/order_summary_patch.js
new file mode 100644
index 0000000..8f6246d
--- /dev/null
+++ b/addons/laundry_management/static/src/js/order_summary_patch.js
@@ -0,0 +1,34 @@
+/** @odoo-module
+ *
+ * OrderSummary integration:
+ *   1. Register the LaundryOrderContextPanel as a child component.
+ *   2. Lock numpad-driven mutations (qty / discount / price / remove)
+ *      while the active order is in settle-due mode. The settlement
+ *      amount is fixed and must not be touched from the order summary.
+ */
+import { patch } from "@web/core/utils/patch";
+import { _t } from "@web/core/l10n/translation";
+import { OrderSummary } from "@point_of_sale/app/screens/product_screen/order_summary/order_summary";
+import { LaundryOrderContextPanel } from "@laundry_management/js/laundry_order_context_panel";
+import { LaundrySettleBanner } from "@laundry_management/js/laundry_settle_banner";
+
+OrderSummary.components = {
+    ...(OrderSummary.components || {}),
+    LaundryOrderContextPanel,
+    LaundrySettleBanner,
+};
+
+patch(OrderSummary.prototype, {
+    async updateSelectedOrderline(args) {
+        const order = this.pos.getOrder();
+        if (this.pos.isSettleDueOrder(order)) {
+            this.numberBuffer.reset();
+            this.pos.notification.add(
+                _t("Settlement amount is fixed. Cannot modify from the cart."),
+                { type: "warning" }
+            );
+            return;
+        }
+        return super.updateSelectedOrderline(args);
+    },
+});