diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index 4c87dc7cd22..d4fa02c752b 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -424,6 +424,6 @@ def validate_bom_no(item, bom_no):
 	if bom.docstatus != 1:
 		if not getattr(frappe.flags, "in_test", False):
 			frappe.throw(_("BOM {0} must be submitted").format(bom_no))
-	if item and not (bom.item == item or \
-		bom.item == frappe.db.get_value("Item", item, "variant_of")):
+	if item and not (bom.item.lower() == item.lower() or \
+		bom.item.lower() == frappe.db.get_value("Item", item, "variant_of").lower()):
 		frappe.throw(_("BOM {0} does not belong to Item {1}").format(bom_no, item))