fix: Unable to submit landed cost voucher (#20493)

* fix: Unable to submit landed cost voucher

* fix: Test case for multiple landed cost voucher against a Purchase receipt

* fix: Test Case

erpnext/stock/doctype/landed_cost_voucher/test_landed_cost_voucher.py

@@ -162,6 +162,76 @@ class TestLandedCostVoucher(unittest.TestCase):
 		self.assertEqual(lcv.items[0].applicable_charges, 41.07)
 		self.assertEqual(lcv.items[2].applicable_charges, 41.08)
 
+	def test_multiple_landed_cost_voucher_against_pr(self):
+		pr = make_purchase_receipt(company="_Test Company with perpetual inventory", warehouse = "Stores - TCP1", 
+			supplier_warehouse = "Stores - TCP1", do_not_save=True)
+
+		pr.append("items", {
+			"item_code": "_Test Item",
+			"warehouse": "Stores - TCP1",
+			"cost_center": "Main - TCP1",
+			"qty": 5,
+			"rate": 100
+		})
+
+		pr.submit()
+
+		lcv1 = make_landed_cost_voucher(receipt_document_type = 'Purchase Receipt', 
+			receipt_document=pr.name, charges=100, do_not_save=True)
+
+		lcv1.insert()
+		lcv1.set('items', [
+			lcv1.get('items')[0]
+		])
+		distribute_landed_cost_on_items(lcv1)
+
+		lcv1.submit()
+
+		lcv2 = make_landed_cost_voucher(receipt_document_type = 'Purchase Receipt', 
+			receipt_document=pr.name, charges=100, do_not_save=True)
+
+		lcv2.insert()
+		lcv2.set('items', [
+			lcv2.get('items')[1]
+		])
+		distribute_landed_cost_on_items(lcv2)
+
+		lcv2.submit()
+
+		pr.load_from_db()
+
+		self.assertEqual(pr.items[0].landed_cost_voucher_amount, 100)
+		self.assertEqual(pr.items[1].landed_cost_voucher_amount, 100)
+
+def make_landed_cost_voucher(** args):
+	args = frappe._dict(args)
+	ref_doc = frappe.get_doc(args.receipt_document_type, args.receipt_document)
+
+	lcv = frappe.new_doc('Landed Cost Voucher')
+	lcv.company = '_Test Company'
+	lcv.distribute_charges_based_on = 'Amount'
+
+	lcv.set('purchase_receipts', [{
+		"receipt_document_type": args.receipt_document_type,
+		"receipt_document": args.receipt_document,
+		"supplier": ref_doc.supplier,
+		"posting_date": ref_doc.posting_date,
+		"grand_total": ref_doc.grand_total
+	}])
+
+	lcv.set("taxes", [{
+		"description": "Shipping Charges",
+		"expense_account": "Expenses Included In Valuation - TCP1",
+		"amount": args.charges
+	}])
+
+	if not args.do_not_save:
+		lcv.insert()
+		if not args.do_not_submit:
+			lcv.submit()
+
+	return lcv
+
 
 def submit_landed_cost_voucher(receipt_document_type, receipt_document, charges=50):
 	ref_doc = frappe.get_doc(receipt_document_type, receipt_document)

erpnext/stock/doctype/purchase_receipt/purchase_receipt.py

@@ -617,22 +617,15 @@ def get_item_account_wise_additional_cost(purchase_document):
 	if not landed_cost_vouchers:
 		return
 	
-	total_item_cost = 0
 	item_account_wise_cost = {}
-	item_cost_allocated = []
 
 	for lcv in landed_cost_vouchers:
-		landed_cost_voucher_doc = frappe.get_cached_doc("Landed Cost Voucher", lcv.parent)
+		landed_cost_voucher_doc = frappe.get_doc("Landed Cost Voucher", lcv.parent)
 		based_on_field = frappe.scrub(landed_cost_voucher_doc.distribute_charges_based_on)
+		total_item_cost = 0
 
 		for item in landed_cost_voucher_doc.items:
-			if item.purchase_receipt_item not in item_cost_allocated:
+			total_item_cost += item.get(based_on_field)
-				total_item_cost += item.get(based_on_field)
-				item_cost_allocated.append(item.purchase_receipt_item)
-
-	for lcv in landed_cost_vouchers:
-		landed_cost_voucher_doc = frappe.get_cached_doc("Landed Cost Voucher", lcv.parent)
-		based_on_field = frappe.scrub(landed_cost_voucher_doc.distribute_charges_based_on)
 
 		for item in landed_cost_voucher_doc.items:
 			if item.receipt_document == purchase_document: