diff --git a/erpnext/public/js/utils/barcode_scanner.js b/erpnext/public/js/utils/barcode_scanner.js
index dd585041d71..9f344a6c576 100644
--- a/erpnext/public/js/utils/barcode_scanner.js
+++ b/erpnext/public/js/utils/barcode_scanner.js
@@ -15,6 +15,11 @@ erpnext.utils.BarcodeScanner = class BarcodeScanner {
 		this.warehouse_field = opts.warehouse_field || "warehouse";
 		// field name on row which defines max quantity to be scanned e.g. picklist
 		this.max_qty_field = opts.max_qty_field;
+		// row fields that, if set, mean max_qty_field is a real demand qty (e.g. from a
+		// linked Sales Order) that scanning must not exceed. Rows with none of these set
+		// have no real demand qty, so max_qty_field is just an arbitrary default and
+		// shouldn't cap further scans.
+		this.demand_ref_fields = opts.demand_ref_fields || [];
 		// scanner won't add a new row if this flag is set.
 		this.dont_allow_new_row = opts.dont_allow_new_row;
 		// scanner will ask user to type the quantity instead of incrementing by 1
@@ -390,6 +395,9 @@ erpnext.utils.BarcodeScanner = class BarcodeScanner {
 	}
 
 	async set_barcode_uom(row, uom) {
+		// e.g. Pick List: picked_qty is always tracked in stock UOM, so an incidental
+		// barcode uom must not overwrite the row's own uom.
+		if (this.max_qty_field) return;
 		if (uom && frappe.meta.has_field(row.doctype, this.uom_field)) {
 			await frappe.model.set_value(row.doctype, row.name, this.uom_field, uom);
 		}
@@ -454,8 +462,9 @@ erpnext.utils.BarcodeScanner = class BarcodeScanner {
 		const matching_row = (row) => {
 			const item_match = row.item_code == item_code;
 			const batch_match = !row[this.batch_no_field] || row[this.batch_no_field] == batch_no;
-			const uom_match = !uom || row[this.uom_field] == uom;
-			const qty_in_limit = flt(row[this.qty_field]) < flt(row[this.max_qty_field]);
+			const uom_match = !uom || this.max_qty_field || row[this.uom_field] == uom;
+			const has_demand_qty = this.demand_ref_fields.some((fieldname) => row[fieldname]);
+			const qty_in_limit = !has_demand_qty || flt(row[this.qty_field]) < flt(row[this.max_qty_field]);
 			const item_scanned = row.has_item_scanned;
 
 			let warehouse_match = true;
diff --git a/erpnext/stock/doctype/pick_list/pick_list.js b/erpnext/stock/doctype/pick_list/pick_list.js
index bcb194bd23c..e50f8bc4390 100644
--- a/erpnext/stock/doctype/pick_list/pick_list.js
+++ b/erpnext/stock/doctype/pick_list/pick_list.js
@@ -288,7 +288,8 @@ frappe.ui.form.on("Pick List", {
 			items_table_name: "locations",
 			qty_field: "picked_qty",
 			max_qty_field: "qty",
-			dont_allow_new_row: true,
+			demand_ref_fields: ["sales_order_item", "material_request_item", "product_bundle_item"],
+			dont_allow_new_row: !frm.doc.pick_manually,
 			prompt_qty: frm.doc.prompt_qty,
 			serial_no_field: "not_supported", // doesn't make sense for picklist without a separate field.
 		};