fix: incorrect Reserved Qty for Production Plan in BIN for the multi-uom case (backport #36162)

erpnext/manufacturing/doctype/production_plan/production_plan.py

@@ -1539,7 +1539,7 @@ 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.required_bom_qty * IfNull(child.conversion_factor, 1.0)))
+		.select(Sum(child.quantity * IfNull(child.conversion_factor, 1.0)))
 		.where(
 			(table.docstatus == 1)
 			& (child.item_code == item_code)

erpnext/manufacturing/doctype/production_plan/test_production_plan.py

@@ -933,6 +933,54 @@ def test_resered_qty_for_production_plan_for_material_requests(self):
 
 		self.assertEqual(after_qty, before_qty)
 
+	def test_resered_qty_for_production_plan_for_material_requests_with_multi_UOM(self):
+		from erpnext.stock.utils import get_or_make_bin
+
+		fg_item = make_item(properties={"is_stock_item": 1, "stock_uom": "_Test UOM 1"}).name
+		bom_item = make_item(
+			properties={"is_stock_item": 1, "stock_uom": "_Test UOM 1", "purchase_uom": "Nos"}
+		).name
+
+		if not frappe.db.exists("UOM Conversion Detail", {"parent": bom_item, "uom": "Nos"}):
+			doc = frappe.get_doc("Item", bom_item)
+			doc.append("uoms", {"uom": "Nos", "conversion_factor": 25})
+			doc.save()
+
+		make_bom(item=fg_item, raw_materials=[bom_item], source_warehouse="_Test Warehouse - _TC")
+
+		bin_name = get_or_make_bin(bom_item, "_Test Warehouse - _TC")
+		before_qty = flt(frappe.db.get_value("Bin", bin_name, "reserved_qty_for_production_plan"))
+
+		pln = create_production_plan(
+			item_code=fg_item, planned_qty=100, ignore_existing_ordered_qty=1, stock_uom="_Test UOM 1"
+		)
+
+		for row in pln.mr_items:
+			self.assertEqual(row.uom, "Nos")
+			self.assertEqual(row.quantity, 4)
+
+			reserved_qty = flt(frappe.db.get_value("Bin", bin_name, "reserved_qty_for_production_plan"))
+			self.assertEqual(reserved_qty - before_qty, 100.0)
+
+		pln.submit_material_request = 1
+		pln.make_work_order()
+
+		for work_order in frappe.get_all(
+			"Work Order",
+			fields=["name"],
+			filters={"production_plan": pln.name},
+		):
+			wo_doc = frappe.get_doc("Work Order", work_order.name)
+			wo_doc.source_warehouse = "_Test Warehouse - _TC"
+			wo_doc.wip_warehouse = "_Test Warehouse 1 - _TC"
+			wo_doc.fg_warehouse = "_Test Warehouse - _TC"
+			wo_doc.submit()
+
+		reserved_qty_after_mr = flt(
+			frappe.db.get_value("Bin", bin_name, "reserved_qty_for_production_plan")
+		)
+		self.assertEqual(reserved_qty_after_mr, before_qty)
+
 	def test_skip_available_qty_for_sub_assembly_items(self):
 		from erpnext.manufacturing.doctype.bom.test_bom import create_nested_bom
 

erpnext/stock/doctype/material_request/material_request.py

@@ -118,8 +118,8 @@ def set_title(self):
 			self.title = _("{0} Request for {1}").format(_(self.material_request_type), items)[:100]
 
 	def on_submit(self):
-		self.update_requested_qty()
 		self.update_requested_qty_in_production_plan()
+		self.update_requested_qty()
 		if self.material_request_type == "Purchase":
 			self.validate_budget()
 
@@ -178,8 +178,8 @@ def status_can_change(self, status):
 				)
 
 	def on_cancel(self):
-		self.update_requested_qty()
 		self.update_requested_qty_in_production_plan()
+		self.update_requested_qty()
 
 	def get_mr_items_ordered_qty(self, mr_items):
 		mr_items_ordered_qty = {}
@@ -270,7 +270,13 @@ def update_requested_qty(self, mr_item_rows=None):
 				item_wh_list.append([d.item_code, d.warehouse])
 
 		for item_code, warehouse in item_wh_list:
-			update_bin_qty(item_code, warehouse, {"indented_qty": get_indented_qty(item_code, warehouse)})
+			update_bin_qty(
+				item_code,
+				warehouse,
+				{
+					"indented_qty": get_indented_qty(item_code, warehouse),
+				},
+			)
 
 	def update_requested_qty_in_production_plan(self):
 		production_plans = []