fix: double future qty updates

update_qty_in_future_sle is reprocessing rows which are already
processed by process_sle_against_current_voucher

erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py

@@ -1183,6 +1183,42 @@ class TestStockLedgerEntry(FrappeTestCase):
 		backdated.cancel()
 		self.assertEqual([1], ordered_qty_after_transaction())
 
+	def test_timestamp_clash(self):
+
+		item = make_item().name
+		warehouse = "_Test Warehouse - _TC"
+
+		reciept = make_stock_entry(
+			item_code=item,
+			to_warehouse=warehouse,
+			qty=100,
+			rate=10,
+			posting_date="2021-01-01",
+			posting_time="01:00:00",
+		)
+
+		consumption = make_stock_entry(
+			item_code=item,
+			from_warehouse=warehouse,
+			qty=50,
+			posting_date="2021-01-01",
+			posting_time="02:00:00.1234",  # ms are possible when submitted without editing posting time
+		)
+
+		backdated_receipt = make_stock_entry(
+			item_code=item,
+			to_warehouse=warehouse,
+			qty=100,
+			posting_date="2021-01-01",
+			rate=10,
+			posting_time="02:00:00",  # same posting time as consumption but ms part stripped
+		)
+
+		try:
+			backdated_receipt.cancel()
+		except Exception as e:
+			self.fail("Double processing of qty for clashing timestamp.")
+
 
 def create_repack_entry(**args):
 	args = frappe._dict(args)

erpnext/stock/stock_ledger.py

@@ -1303,6 +1303,8 @@ def update_qty_in_future_sle(args, allow_negative_stock=False):
 	datetime_limit_condition = ""
 	qty_shift = args.actual_qty
 
+	args["time_format"] = "%H:%i:%s"
+
 	# find difference/shift in qty caused by stock reconciliation
 	if args.voucher_type == "Stock Reconciliation":
 		qty_shift = get_stock_reco_qty_shift(args)
@@ -1323,12 +1325,8 @@ def update_qty_in_future_sle(args, allow_negative_stock=False):
 			and warehouse = %(warehouse)s
 			and voucher_no != %(voucher_no)s
 			and is_cancelled = 0
-			and (timestamp(posting_date, posting_time) > timestamp(%(posting_date)s, %(posting_time)s)
+			and timestamp(posting_date, time_format(posting_time, %(time_format)s))
-				or (
+				> timestamp(%(posting_date)s, time_format(%(posting_time)s, %(time_format)s))
-					timestamp(posting_date, posting_time) = timestamp(%(posting_date)s, %(posting_time)s)
-					and creation > %(creation)s
-				)
-			)
 		{datetime_limit_condition}
 		""".format(
 			qty_shift=qty_shift, datetime_limit_condition=datetime_limit_condition