fix: incorrect rate in BOM exploded items (backport #31513) (#31865)

* fix: incorrect rate in BOM exploded items (#31513)

(cherry picked from commit 313625c349)

# Conflicts:
#	erpnext/manufacturing/doctype/bom_item/bom_item.json

* chore: conflicts

Co-authored-by: Sagar Sharma <sagarsharma.s312@gmail.com>

erpnext/manufacturing/doctype/bom/bom.py

@@ -189,8 +189,8 @@ class BOM(WebsiteGenerator):
 		self.validate_transfer_against()
 		self.set_routing_operations()
 		self.validate_operations()
-		self.update_exploded_items(save=False)
 		self.calculate_cost()
+		self.update_exploded_items(save=False)
 		self.update_stock_qty()
 		self.validate_scrap_items()
 		self.update_cost(update_parent=False, from_child_bom=True, update_hour_rate=False, save=False)

erpnext/manufacturing/doctype/bom/test_bom.py

@@ -555,6 +555,34 @@ class TestBOM(FrappeTestCase):
 		bom.reload()
 		self.assertEqual(frappe.get_value("Item", fg_item.item_code, "default_bom"), bom.name)
 
+	def test_exploded_items_rate(self):
+		rm_item = make_item(
+			properties={"is_stock_item": 1, "valuation_rate": 99, "last_purchase_rate": 89}
+		).name
+		fg_item = make_item(properties={"is_stock_item": 1}).name
+
+		from erpnext.manufacturing.doctype.production_plan.test_production_plan import make_bom
+
+		bom = make_bom(item=fg_item, raw_materials=[rm_item], do_not_save=True)
+
+		bom.rm_cost_as_per = "Last Purchase Rate"
+		bom.save()
+		self.assertEqual(bom.items[0].base_rate, 89)
+		self.assertEqual(bom.exploded_items[0].rate, bom.items[0].base_rate)
+
+		bom.rm_cost_as_per = "Price List"
+		bom.save()
+		self.assertEqual(bom.items[0].base_rate, 0.0)
+		self.assertEqual(bom.exploded_items[0].rate, bom.items[0].base_rate)
+
+		bom.rm_cost_as_per = "Valuation Rate"
+		bom.save()
+		self.assertEqual(bom.items[0].base_rate, 99)
+		self.assertEqual(bom.exploded_items[0].rate, bom.items[0].base_rate)
+
+		bom.submit()
+		self.assertEqual(bom.exploded_items[0].rate, bom.items[0].base_rate)
+
 
 def get_default_bom(item_code="_Test FG Item 2"):
 	return frappe.db.get_value("BOM", {"item": item_code, "is_active": 1, "is_default": 1})

erpnext/manufacturing/doctype/bom_item/bom_item.json

@@ -185,6 +185,7 @@
    "in_list_view": 1,
    "label": "Rate",
    "options": "currency",
+   "read_only": 1,
    "reqd": 1
   },
   {
@@ -298,7 +299,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2022-01-24 16:57:57.020232",
+ "modified": "2022-07-28 10:20:51.559010",
  "modified_by": "Administrator",
  "module": "Manufacturing",
  "name": "BOM Item",