fix: stock reservation cancellation for transfer case

erpnext/manufacturing/doctype/production_plan/production_plan.py

@@ -1928,7 +1928,12 @@ def get_reserved_qty_for_production_plan(item_code, warehouse):
 		frappe.qb.from_(table)
 		.inner_join(child)
 		.on(table.name == child.parent)
-		.select(Sum(child.quantity * child.conversion_factor))
+		.select(
+			Sum(
+				Case().when(child.quantity == 0, child.required_bom_qty).else_(child.quantity)
+				* child.conversion_factor
+			)
+		)
 		.where(
 			(table.docstatus == 1)
 			& (child.item_code == item_code)

erpnext/stock/doctype/stock_reservation_entry/stock_reservation_entry.py

@@ -109,6 +109,37 @@ class StockReservationEntry(Document):
 		self.update_status()
 		self.update_reserved_stock_in_bin()
 
+	def before_cancel(self) -> None:
+		self.validate_reserved_entries()
+
+	def validate_reserved_entries(self):
+		entries = frappe.get_all(
+			"Stock Reservation Entry",
+			fields=["voucher_no as name"],
+			filters={
+				"status": "Closed",
+				"docstatus": 1,
+				"from_voucher_type": "Purchase Receipt",
+				"from_voucher_no": self.from_voucher_no,
+			},
+		)
+
+		if entries:
+			work_orders = frappe.get_all(
+				"Work Order",
+				fields=["name"],
+				filters={"production_plan": ("in", [entry.name for entry in entries])},
+			)
+
+			frappe.throw(
+				_(
+					"Cannot cancel Stock Reservation Entry {0}, as it has used in the work order {1}. Please cancel the work order first or unreserved the stock"
+				).format(
+					", ".join([frappe.bold(entry.name) for entry in entries]),
+					", ".join([frappe.bold(wo.name) for wo in work_orders]),
+				)
+			)
+
 	def update_unreserved_qty_in_sre(self):
 		if self.voucher_type == "Delivery Note":
 			return