fix: reinstate duplicate entry check for manufacture entries

The stock_entry.py split (#54466) dropped check_duplicate_entry_for_work_order
and DuplicateEntryForWorkOrderError with no replacement. The Work Order still
throws StockOverProductionError when submitted entries exceed the planned qty,
but nothing blocks saving another Manufacture entry, draft or submitted, once
existing entries already cover the full work order qty.

Restore the validation in the manufacture purpose handler, gated to work
orders without track_semi_finished_goods, matching the pre-split behaviour.

erpnext/stock/doctype/stock_entry/services/manufacturing.py

@@ -21,6 +21,10 @@ from .serial_batch import create_serial_and_batch_bundle
 from .stock_entry_base import BaseStockEntry
 
 
+class DuplicateEntryForWorkOrderError(frappe.ValidationError):
+	pass
+
+
 class OperationsNotCompleteError(frappe.ValidationError):
 	pass
 
@@ -279,6 +283,7 @@ class ManufactureStockEntry(BaseManufactureStockEntry):
 		self.validate_warehouse()
 		self.validate_raw_materials_exists()
 		self.check_if_operations_completed()
+		self.check_duplicate_entry_for_work_order()
 		self.validate_component_and_quantities()
 		self.validate_finished_good_serial_batch_for_work_order()
 
@@ -430,6 +435,46 @@ class ManufactureStockEntry(BaseManufactureStockEntry):
 			OperationsNotCompleteError,
 		)
 
+	def check_duplicate_entry_for_work_order(self):
+		"""Block another manufacture entry once existing entries already cover the full work order qty."""
+		if not self.wo_doc or self.wo_doc.track_semi_finished_goods:
+			return
+
+		other_entries = frappe.get_all(
+			"Stock Entry",
+			filters={
+				"work_order": self.doc.work_order,
+				"purpose": self.doc.purpose,
+				"docstatus": ["!=", 2],
+				"name": ["!=", self.doc.name],
+			},
+			pluck="name",
+		)
+		if not other_entries:
+			return
+
+		if self.get_fg_qty_already_entered(other_entries) >= flt(self.wo_doc.qty):
+			frappe.throw(
+				_("Stock Entries already created for Work Order {0}: {1}").format(
+					self.doc.work_order, ", ".join(other_entries)
+				),
+				DuplicateEntryForWorkOrderError,
+			)
+
+	def get_fg_qty_already_entered(self, other_entries):
+		child = frappe.qb.DocType("Stock Entry Detail")
+		qty = (
+			frappe.qb.from_(child)
+			.select(Sum(child.transfer_qty))
+			.where(
+				child.parent.isin(other_entries)
+				& (child.item_code == self.wo_doc.production_item)
+				& (child.s_warehouse.isnull() | (child.s_warehouse == ""))
+			)
+			.run()
+		)[0][0]
+		return flt(qty)
+
 	def add_items(self):
 		self.add_raw_materials()
 		self.set_process_loss_qty()

erpnext/stock/doctype/stock_entry/stock_entry.py

@@ -38,6 +38,7 @@ from erpnext.stock.utils import get_incoming_rate
 
 from .services.disassemble import DisassembleStockEntry
 from .services.manufacturing import (
+	DuplicateEntryForWorkOrderError,
 	ManufactureStockEntry,
 	MaterialConsumptionForManufactureStockEntry,
 	OperationsNotCompleteError,