fix: skip stock reservation for opted-out production plans

(cherry picked from commit 71f02d412a)

# Conflicts:
#	erpnext/stock/doctype/purchase_receipt/services/reservation.py

erpnext/stock/doctype/purchase_receipt/services/reservation.py

@@ -0,0 +1,150 @@
+# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+"""Stock reservation on Purchase Receipt submission (Sales Order / Production Plan)."""
+
+import frappe
+from frappe import _
+from frappe.utils import get_datetime
+
+from erpnext.stock.doctype.stock_reservation_entry.stock_reservation_entry import StockReservation
+
+
+class PurchaseReceiptStockReservation:
+	def __init__(self, doc):
+		self.doc = doc
+
+	def reserve_stock(self) -> None:
+		self.reserve_stock_for_sales_order()
+		self.reserve_stock_for_production_plan()
+
+	def reserve_stock_for_sales_order(self) -> None:
+		doc = self.doc
+		if (
+			doc.is_return
+			or not frappe.get_single_value("Stock Settings", "enable_stock_reservation")
+			or not frappe.get_single_value("Stock Settings", "auto_reserve_stock_for_sales_order_on_purchase")
+		):
+			return
+
+		doc.reload()  # reload to get the Serial and Batch Bundle Details
+
+		so_items_details_map = {}
+		for item in doc.items:
+			if item.sales_order and item.sales_order_item:
+				item_details = {
+					"sales_order_item": item.sales_order_item,
+					"item_code": item.item_code,
+					"warehouse": item.warehouse,
+					"qty_to_reserve": item.stock_qty,
+					"from_voucher_no": item.parent,
+					"from_voucher_detail_no": item.name,
+					"serial_and_batch_bundle": item.serial_and_batch_bundle,
+				}
+				so_items_details_map.setdefault(item.sales_order, []).append(item_details)
+
+		if so_items_details_map:
+			if get_datetime(f"{doc.posting_date} {doc.posting_time}") > get_datetime():
+				return frappe.msgprint(
+					_("Cannot create Stock Reservation Entries for future dated Purchase Receipts.")
+				)
+
+			for so, items_details in so_items_details_map.items():
+				so_doc = frappe.get_lazy_doc("Sales Order", so)
+				so_doc.create_stock_reservation_entries(
+					items_details=items_details,
+					from_voucher_type="Purchase Receipt",
+					notify=True,
+				)
+
+	def reserve_stock_for_production_plan(self) -> None:
+		doc = self.doc
+		if doc.is_return or not frappe.get_single_value("Stock Settings", "enable_stock_reservation"):
+			return
+
+		production_plan_references = self.get_production_plan_references()
+		if not production_plan_references:
+			return
+
+		reservable_plans = self.get_reservable_production_plans(production_plan_references)
+		if not reservable_plans:
+			return
+
+		production_plan_items = []
+		doc.reload()
+
+		docnames = []
+		for row in doc.items:
+			if row.material_request_item and row.material_request_item in production_plan_references:
+				_ref = production_plan_references[row.material_request_item]
+				if _ref.production_plan not in reservable_plans:
+					continue
+
+				docnames.append(_ref.production_plan)
+				row.update(
+					{
+						"voucher_type": "Production Plan",
+						"voucher_no": _ref.production_plan,
+						"voucher_detail_no": _ref.material_request_plan_item,
+						"from_voucher_no": doc.name,
+						"from_voucher_detail_no": row.name,
+						"from_voucher_type": doc.doctype,
+						"serial_and_batch_bundles": [row.serial_and_batch_bundle],
+					}
+				)
+
+				production_plan_items.append(row)
+
+		if not production_plan_items:
+			return
+
+		sre = StockReservation(doc=doc, items=production_plan_items)
+		sre.make_stock_reservation_entries()
+		if docnames:
+			sre.transfer_reservation_entries_to(
+				docnames, from_doctype="Production Plan", to_doctype="Work Order"
+			)
+
+	def get_reservable_production_plans(self, production_plan_references: frappe._dict) -> set:
+		"""Production Plans that opted into stock reservation (``reserve_stock``).
+
+		A Production Plan only gets this flag set if "Auto Reserve Stock" was enabled in
+		Stock Settings when it was created, or the user ticked "Reserve Stock" manually.
+		Without this check, a Purchase Receipt would auto-reserve stock for every
+		Production Plan whenever "Enable Stock Reservation" is on, ignoring both of those.
+		"""
+		plan_names = {ref.production_plan for ref in production_plan_references.values()}
+		return {
+			p.name
+			for p in frappe.get_all(
+				"Production Plan",
+				filters={"name": ["in", list(plan_names)]},
+				fields=["name", "reserve_stock"],
+			)
+			if p.reserve_stock
+		}
+
+	def get_production_plan_references(self) -> frappe._dict:
+		production_plan_references = frappe._dict()
+		material_request_items = []
+
+		for row in self.doc.items:
+			if row.material_request_item:
+				material_request_items.append(row.material_request_item)
+
+		if not material_request_items:
+			return frappe._dict()
+
+		items = frappe.get_all(
+			"Material Request Item",
+			fields=["material_request_plan_item", "production_plan", "name"],
+			filters={"name": ["in", material_request_items], "docstatus": 1},
+		)
+
+		for item in items:
+			if not item.production_plan:
+				continue
+
+			production_plan_references.setdefault(item.name, item)
+
+		return production_plan_references