diff --git a/erpnext/public/js/utils/serial_no_batch_selector.js b/erpnext/public/js/utils/serial_no_batch_selector.js
index ae8d3d455cb..81ff351d373 100644
--- a/erpnext/public/js/utils/serial_no_batch_selector.js
+++ b/erpnext/public/js/utils/serial_no_batch_selector.js
@@ -94,6 +94,7 @@ erpnext.SerialNoBatchSelector = class SerialNoBatchSelector {
 				description: __('Fetch Serial Numbers based on FIFO'),
 				click: () => {
 					let qty = this.dialog.fields_dict.qty.get_value();
+					let already_selected_serial_nos = get_selected_serial_nos(me);
 					let numbers = frappe.call({
 						method: "erpnext.stock.doctype.serial_no.serial_no.auto_fetch_serial_number",
 						args: {
@@ -101,7 +102,8 @@ erpnext.SerialNoBatchSelector = class SerialNoBatchSelector {
 							item_code: me.item_code,
 							warehouse: typeof me.warehouse_details.name == "string" ? me.warehouse_details.name : '',
 							batch_nos: me.item.batch_no || null,
-							posting_date: me.frm.doc.posting_date || me.frm.doc.transaction_date
+							posting_date: me.frm.doc.posting_date || me.frm.doc.transaction_date,
+							exclude_sr_nos: already_selected_serial_nos
 						}
 					});
 
@@ -577,15 +579,29 @@ function get_pending_qty_fields(me) {
 	return pending_qty_fields;
 }
 
-function calc_total_selected_qty(me) {
+// get all items with same item code except row for which selector is open.
+function get_rows_with_same_item_code(me) {
 	const { frm: { doc: { items }}, item: { name, item_code }} = me;
-	const totalSelectedQty = items
-		.filter( item => ( item.name !== name ) && ( item.item_code === item_code ) )
-		.map( item => flt(item.qty) )
-		.reduce( (i, j) => i + j, 0);
+	return items.filter(item => (item.name !== name) && (item.item_code === item_code))
+}
+
+function calc_total_selected_qty(me) {
+	const totalSelectedQty = get_rows_with_same_item_code(me)
+		.map(item => flt(item.qty))
+		.reduce((i, j) => i + j, 0);
 	return totalSelectedQty;
 }
 
+function get_selected_serial_nos(me) {
+	const selected_serial_nos = get_rows_with_same_item_code(me)
+		.map(item => item.serial_no)
+		.filter(serial => serial)
+		.map(sr_no_string => sr_no_string.split('\n'))
+		.reduce((acc, arr) => acc.concat(arr), [])
+		.filter(serial => serial);
+	return selected_serial_nos;
+};
+
 function check_can_calculate_pending_qty(me) {
 	const { frm: { doc }, item } = me;
 	const docChecks = doc.bom_no
diff --git a/erpnext/stock/doctype/serial_no/serial_no.py b/erpnext/stock/doctype/serial_no/serial_no.py
index bf62f50c971..3cb97558c2f 100644
--- a/erpnext/stock/doctype/serial_no/serial_no.py
+++ b/erpnext/stock/doctype/serial_no/serial_no.py
@@ -564,9 +564,15 @@ def get_delivery_note_serial_no(item_code, qty, delivery_note):
 	return serial_nos
 
 @frappe.whitelist()
-def auto_fetch_serial_number(qty, item_code, warehouse, posting_date=None, batch_nos=None, for_doctype=None):
+def auto_fetch_serial_number(qty, item_code, warehouse,
+		posting_date=None, batch_nos=None, for_doctype=None, exclude_sr_nos=None):
 	filters = { "item_code": item_code, "warehouse": warehouse }
 
+	if exclude_sr_nos is None:
+		exclude_sr_nos = []
+	else:
+		exclude_sr_nos = get_serial_nos(clean_serial_no_string("\n".join(exclude_sr_nos)))
+
 	if batch_nos:
 		try:
 			filters["batch_no"] = json.loads(batch_nos) if (type(json.loads(batch_nos)) == list) else [json.loads(batch_nos)]
@@ -578,10 +584,9 @@ def auto_fetch_serial_number(qty, item_code, warehouse, posting_date=None, batch
 
 	serial_numbers = []
 	if for_doctype == 'POS Invoice':
-		reserved_sr_nos = get_pos_reserved_serial_nos(filters)
-		serial_numbers = fetch_serial_numbers(filters, qty, do_not_include=reserved_sr_nos)
-	else:
-		serial_numbers = fetch_serial_numbers(filters, qty)
+		exclude_sr_nos.extend(get_pos_reserved_serial_nos(filters))
+
+	serial_numbers = fetch_serial_numbers(filters, qty, do_not_include=exclude_sr_nos)
 
 	return [d.get('name') for d in serial_numbers]