diff --git a/addons/point_of_sale/static/src/app/store/models.js b/addons/point_of_sale/static/src/app/store/models.js
index 3ec381655f6..8a7ee890191 100644
--- a/addons/point_of_sale/static/src/app/store/models.js
+++ b/addons/point_of_sale/static/src/app/store/models.js
@@ -506,7 +506,7 @@ export class Orderline extends PosModel {
      *    @param {Object} modifiedPackLotLines key-value pair of String (the cid) & String (the new lot_name)
      *    @param {Array} newPackLotLines array of { lot_name: String }
      */
-    setPackLotLines({ modifiedPackLotLines, newPackLotLines }) {
+    setPackLotLines({ modifiedPackLotLines, newPackLotLines , setQuantity = true }) {
         // Set the new values for modified lot lines.
         const lotLinesToRemove = [];
         for (const lotLine of this.pack_lot_lines) {
@@ -534,7 +534,7 @@ export class Orderline extends PosModel {
         }
 
         // Set the quantity of the line based on number of pack lots.
-        if (!this.product.to_weight) {
+        if (!this.product.to_weight && setQuantity) {
             this.set_quantity_by_lot();
         }
     }
@@ -2063,7 +2063,7 @@ export class Order extends PosModel {
         }
 
         if (options.draftPackLotLines) {
-            this.selected_orderline.setPackLotLines(options.draftPackLotLines);
+            this.selected_orderline.setPackLotLines({ ...options.draftPackLotLines, setQuantity: options.quantity === undefined });
         }
 
         if (options.comboLines?.length) {