From 3bdac5c30a563bb6b565d603192972aeccaed5cf Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Sat, 11 Apr 2026 05:06:40 +0000
Subject: [PATCH] fix: batch/serial should use parent's posting datetime for
 naming (backport #54206) (#54209)

---
 erpnext/accounts/utils.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/erpnext/accounts/utils.py b/erpnext/accounts/utils.py
index 5b1bce2cb35..0c23353d1eb 100644
--- a/erpnext/accounts/utils.py
+++ b/erpnext/accounts/utils.py
@@ -1603,6 +1603,10 @@ def parse_naming_series_variable(doc, variable):
 
 	else:
 		data = {"YY": "%y", "YYYY": "%Y", "MM": "%m", "DD": "%d", "JJJ": "%j"}
+
+		if doc and doc.doctype in ["Batch", "Serial No"] and doc.reference_doctype and doc.reference_name:
+			doc = frappe.get_doc(doc.reference_doctype, doc.reference_name)
+
 		date = (
 			(
 				getdate(doc.get("posting_date") or doc.get("transaction_date") or doc.get("posting_datetime"))