fix(stock): use stored posting_datetime when reposting stock ledger entries (#58998)

* fix(stock): use stored posting_datetime for repost boundary

get_stock_ledger_entries re-derived posting_datetime from posting_date and
posting_time on every call, discarding the stored value its callers pass in.
when a row's stored posting_datetime differs from that pair, the replay window
is built from the wrong instant: the row falls outside the range filter and is
never recomputed, while get_previous_sle still selects it as the opening
balance and reuses its stale qty_after_transaction. every later entry inherits
the error, leaving bin qty adrift from the sum of its ledger.

derive the boundary only when the caller has not supplied one.

* fix(stock): match current voucher sle on stored posting_datetime

get_sle_against_current_voucher selected rows with an equality check against a
posting_datetime re-derived from posting_date and posting_time. a row whose
stored posting_datetime differs from that pair matches nothing, so reposting
the voucher silently processes zero entries and the row can never be corrected
through its own voucher.

read the timestamp from the stored row when the sle is known, and derive it
only as a fallback.

* test(stock): cover repost with diverged posting_datetime

add a repack scenario whose incoming entry stores a posting_datetime one
microsecond before its own posting_time. asserts the voucher lookup still
finds that entry, and that reposting replays it instead of reusing its stale
qty_after_transaction, which otherwise left bin qty at 115 against 615 of
recorded movements.

erpnext/stock/doctype/stock_ledger_entry/test_stock_ledger_entry.py

@@ -1590,6 +1590,124 @@ class TestStockLedgerEntry(ERPNextTestSuite, StockTestMixin):
 
 		self.assertFalse(frappe.db.exists("Stock Ledger Entry", {"voucher_no": voucher_no}))
 
+	def test_repost_with_diverged_posting_datetime(self):
+		"""Reposting must use the stored posting_datetime, not one rebuilt from posting_date and posting_time."""
+		from erpnext.stock.stock_ledger import get_sle_against_current_voucher
+
+		raw = make_item().name
+		fg = make_item().name
+		warehouse = "_Test Warehouse - _TC"
+		clash_time = "09:04:25.784069"
+
+		make_stock_entry(
+			item_code=fg,
+			to_warehouse=warehouse,
+			qty=123,
+			rate=2,
+			posting_date="2026-08-20",
+			posting_time="10:00:00",
+		)
+		make_stock_entry(
+			item_code=fg,
+			to_warehouse=warehouse,
+			qty=500,
+			rate=2,
+			posting_date="2026-08-22",
+			posting_time="10:00:00",
+		)
+		make_stock_entry(
+			item_code=raw,
+			to_warehouse=warehouse,
+			qty=500,
+			rate=2,
+			posting_date="2026-08-21",
+			posting_time="10:00:00",
+		)
+
+		# issue posted first, then a repack producing the same item at the same posting time
+		make_stock_entry(
+			item_code=fg,
+			from_warehouse=warehouse,
+			qty=500,
+			posting_date="2026-08-24",
+			posting_time=clash_time,
+		)
+
+		repack = make_stock_entry(
+			item_code=raw, source=warehouse, qty=500, rate=2, purpose="Repack", do_not_save=True
+		)
+		repack.set_posting_time = 1
+		repack.posting_date = "2026-08-24"
+		repack.posting_time = clash_time
+		repack.append(
+			"items", {"item_code": fg, "t_warehouse": warehouse, "qty": 500, "conversion_factor": 1}
+		)
+		repack.save()
+		repack.submit()
+
+		make_stock_entry(
+			item_code=fg, from_warehouse=warehouse, qty=8, posting_date="2026-08-25", posting_time="10:00:00"
+		)
+
+		# mimic a repair that backdates the stored value and leaves posting_time untouched
+		incoming = frappe.db.get_value(
+			"Stock Ledger Entry",
+			{"voucher_no": repack.name, "item_code": fg, "actual_qty": (">", 0)},
+			["name", "posting_date", "posting_time", "creation"],
+			as_dict=True,
+		)
+		frappe.db.set_value(
+			"Stock Ledger Entry",
+			incoming.name,
+			"posting_datetime",
+			"2026-08-24 09:04:25.784068",
+			update_modified=False,
+		)
+
+		# the row must stay reachable through its own voucher
+		found = get_sle_against_current_voucher(
+			frappe._dict(
+				{
+					"item_code": fg,
+					"warehouse": warehouse,
+					"posting_date": incoming.posting_date,
+					"posting_time": incoming.posting_time,
+					"creation": incoming.creation,
+					"name": incoming.name,
+				}
+			)
+		)
+		self.assertEqual([d.name for d in found], [incoming.name])
+
+		riv = frappe.get_doc(
+			{
+				"doctype": "Repost Item Valuation",
+				"based_on": "Item and Warehouse",
+				"item_code": raw,
+				"warehouse": warehouse,
+				"posting_date": "2026-08-21",
+				"posting_time": "00:00:00",
+				"company": "_Test Company",
+				"allow_negative_stock": 1,
+			}
+		).insert()
+		riv.submit()
+
+		# the backdated row is replayed instead of contributing a stale balance
+		sle = frappe.qb.DocType("Stock Ledger Entry")
+		balances = (
+			frappe.qb.from_(sle)
+			.select(sle.qty_after_transaction)
+			.where((sle.item_code == fg) & (sle.warehouse == warehouse) & (sle.is_cancelled == 0))
+			.orderby(sle.posting_datetime)
+			.orderby(sle.creation)
+		).run(pluck=True)
+
+		self.assertEqual([flt(b) for b in balances], [123.0, 623.0, 1123.0, 623.0, 615.0])
+		self.assertEqual(
+			flt(frappe.db.get_value("Bin", {"item_code": fg, "warehouse": warehouse}, "actual_qty")), 615.0
+		)
+
 
 def create_repack_entry(**args):
 	args = frappe._dict(args)

erpnext/stock/stock_ledger.py

@@ -1969,7 +1969,15 @@ class update_entries_after:
 
 
 def get_sle_against_current_voucher(kwargs):
-	kwargs["posting_datetime"] = get_combine_datetime(kwargs.posting_date, kwargs.posting_time)
+	# Match on the row's stored posting_datetime. Re-deriving it from posting_date and posting_time
+	# makes rows whose stored value differs unmatchable, so the voucher gets reposted against nothing.
+	if kwargs.get("name") and not kwargs.get("posting_datetime"):
+		kwargs["posting_datetime"] = frappe.db.get_value(
+			"Stock Ledger Entry", kwargs.get("name"), "posting_datetime"
+		)
+
+	if not kwargs.get("posting_datetime"):
+		kwargs["posting_datetime"] = get_combine_datetime(kwargs.posting_date, kwargs.posting_time)
 	doctype = frappe.qb.DocType("Stock Ledger Entry")
 
 	query = (
@@ -2105,14 +2113,19 @@ def get_stock_ledger_entries(
 			frappe.db.escape(f"%\n{serial_no}\n%"),
 		)
 
-	if not previous_sle.get("posting_date"):
-		previous_sle["posting_datetime"] = "1900-01-01 00:00:00"
-	else:
-		posting_time = previous_sle.get("posting_time")
-		if not posting_time:
-			posting_time = "00:00:00"
+	if not previous_sle.get("posting_datetime"):
+		# Derive only when the caller has not supplied the stored posting_datetime. Re-deriving it
+		# would shift the boundary for rows whose stored value differs from posting_date + posting_time.
+		if not previous_sle.get("posting_date"):
+			previous_sle["posting_datetime"] = "1900-01-01 00:00:00"
+		else:
+			posting_time = previous_sle.get("posting_time")
+			if not posting_time:
+				posting_time = "00:00:00"
 
-		previous_sle["posting_datetime"] = get_combine_datetime(previous_sle["posting_date"], posting_time)
+			previous_sle["posting_datetime"] = get_combine_datetime(
+				previous_sle["posting_date"], posting_time
+			)
 
 	if operator in (">", "<=") and previous_sle.get("name"):
 		conditions += " and name!=%(name)s"