diff --git a/erpnext/selling/page/point_of_sale/pos_controller.js b/erpnext/selling/page/point_of_sale/pos_controller.js
index 46320e5..016ebf0 100644
--- a/erpnext/selling/page/point_of_sale/pos_controller.js
+++ b/erpnext/selling/page/point_of_sale/pos_controller.js
@@ -559,8 +559,10 @@
 
 				item_row = this.frm.add_child('items', new_item);
 
-				if (field === 'qty' && value !== 0 && !this.allow_negative_stock)
-					await this.check_stock_availability(item_row, value, this.frm.doc.set_warehouse);
+				if (field === 'qty' && value !== 0 && !this.allow_negative_stock) {
+					const qty_needed = value * item_row.conversion_factor;
+					await this.check_stock_availability(item_row, qty_needed, this.frm.doc.set_warehouse);
+				}
 
 				await this.trigger_new_item_events(item_row);
 
diff --git a/erpnext/stock/doctype/batch/batch.py b/erpnext/stock/doctype/batch/batch.py
index 3b9fe7b..d8f119a 100644
--- a/erpnext/stock/doctype/batch/batch.py
+++ b/erpnext/stock/doctype/batch/batch.py
@@ -376,7 +376,7 @@
 
 	p = frappe.qb.DocType("POS Invoice").as_("p")
 	item = frappe.qb.DocType("POS Invoice Item").as_("item")
-	sum_qty = frappe.query_builder.functions.Sum(item.qty).as_("qty")
+	sum_qty = frappe.query_builder.functions.Sum(item.stock_qty).as_("qty")
 
 	reserved_batch_qty = (
 		frappe.qb.from_(p)