diff --git a/erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py b/erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py
index d0fcec592ad..0c4c368ad3e 100644
--- a/erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py
+++ b/erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py
@@ -34,6 +34,21 @@ class TestStockLedgerEntry(ERPNextTestSuite, StockTestMixin):
 		create_items()
 		reset("Stock Entry")
 
+	def test_stock_write_takes_sle_advisory_gate(self):
+		if frappe.db.db_type != "postgres":
+			return
+
+		item = make_item(properties={"is_stock_item": 1}).name
+
+		def held_advisory_locks():
+			return frappe.db.sql(
+				"SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND pid = pg_backend_pid()"
+			)[0][0]
+
+		before = held_advisory_locks()
+		make_stock_entry(item_code=item, target="_Test Warehouse - _TC", qty=1, rate=10)
+		self.assertGreater(held_advisory_locks(), before)
+
 	def test_incoming_value_for_transferred_serial_no_is_deterministic(self):
 		"""get_incoming_value_for_serial_nos picks the latest SLE (posting_date desc, limit 1) for a
 		serial transferred to another company. posting_date alone is non-total, so two same-date SLEs
diff --git a/erpnext/stock/stock_ledger.py b/erpnext/stock/stock_ledger.py
index c1ce66317bc..e97bbd923ab 100644
--- a/erpnext/stock/stock_ledger.py
+++ b/erpnext/stock/stock_ledger.py
@@ -115,6 +115,10 @@ def make_sl_entries(sl_entries, allow_negative_stock=False, via_landed_cost_vouc
 	from erpnext.controllers.stock_controller import future_sle_exists
 
 	if sl_entries:
+		# Sorted so two vouchers touching the same pairs can't take the gates in opposite order.
+		for pair in sorted({(d.get("item_code"), d.get("warehouse")) for d in sl_entries}):
+			sle_processing_gate(*pair)
+
 		cancelled = sl_entries[0].get("is_cancelled")
 		if cancelled:
 			validate_cancellation(sl_entries)
@@ -285,6 +289,16 @@ def repost_gate(item_code, warehouse):
 	return nullcontext()
 
 
+def sle_processing_gate(item_code, warehouse):
+	"""Serialize all stock writes for an (item, warehouse) on postgres. MariaDB gets this from the
+	gap locks its previous-SLE locking reads take (which also block, then reveal, concurrent
+	inserts); postgres locking reads never see rows another transaction is inserting, so without
+	this gate two concurrent writers compute from the same stale previous SLE and the loser's Bin
+	write is lost. Txn-scoped and re-entrant; released at commit/rollback."""
+	if frappe.db.db_type == "postgres":
+		frappe.db.transaction_advisory_lock(("stock-sle", item_code, warehouse), timeout=REPOST_LOCK_TIMEOUT)
+
+
 def repost_future_sle(
 	items_to_be_repost=None,
 	voucher_type=None,
@@ -594,6 +608,8 @@ class update_entries_after:
 		if self.args.sle_id:
 			self.args["name"] = self.args.sle_id
 
+		sle_processing_gate(self.item_code, self.args.warehouse)
+
 		self.prev_sle_dict = frappe._dict({})
 		self.company = frappe.get_cached_value("Warehouse", self.args.warehouse, "company")
 		self.set_precision()