fix: local reference error in BOM (#38850)

fix: local reference error
diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index f0381d2..7627476 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -1017,6 +1017,8 @@
 		item_doc = frappe.get_cached_doc("Item", args.get("item_code"))
 		price_list_data = get_price_list_rate(bom_args, item_doc)
 		rate = price_list_data.price_list_rate
+	elif bom_doc.rm_cost_as_per == "Manual":
+		return
 
 	return flt(rate)