[fix] add round off difference to last row in landed cost voucher (#8989)

* [fix] add round off difference to last row in landed cost voucher

* Add test case for odd numbers

* Add assertEquals to verify applicable charges

* Use make_purchase_receipt, move round off logic

* Allow rounding difference

* Specify cost center to pass test

erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.js

@@ -102,9 +102,17 @@ erpnext.stock.LandedCostVoucher = erpnext.stock.StockController.extend({
 				total_item_cost += flt(d[based_on])
 			});
 
+			var total_charges = 0.0;
 			$.each(this.frm.doc.items || [], function(i, item) {
 				item.applicable_charges = flt(item[based_on]) * flt(me.frm.doc.total_taxes_and_charges) / flt(total_item_cost)			
+				item.applicable_charges = flt(item.applicable_charges, precision("applicable_charges", item))
+				total_charges += item.applicable_charges
 			});
+
+			if (total_charges != this.frm.doc.total_taxes_and_charges){
+				var diff = this.frm.doc.total_taxes_and_charges - flt(total_charges)
+				this.frm.doc.items.slice(-1)[0].applicable_charges += diff
+			}
 			refresh_field("items");
 		}
 	},

erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.py

@@ -5,6 +5,7 @@ from __future__ import unicode_literals
 import frappe
 from frappe import _
 from frappe.utils import flt
+from frappe.model.meta import get_field_precision
 from frappe.model.document import Document
 from erpnext.stock.doctype.serial_no.serial_no import get_serial_nos
 
@@ -71,7 +72,17 @@ class LandedCostVoucher(Document):
 		if not total:
 			frappe.throw(_("Total {0} for all items is zero, may be you should change 'Distribute Charges Based On'").format(based_on))
 		
-		if self.total_taxes_and_charges != sum([flt(d.applicable_charges) for d in self.get("items")]):
+		total_applicable_charges = sum([flt(d.applicable_charges) for d in self.get("items")])
+
+		precision = get_field_precision(frappe.get_meta("Landed Cost Item").get_field("applicable_charges"),
+		currency=frappe.db.get_value("Company", self.company, "default_currency", cache=True))
+
+		diff = flt(self.total_taxes_and_charges) - flt(total_applicable_charges)
+		diff = flt(diff, precision)
+
+		if abs(diff) < (2.0 / (10**precision)):
+			self.items[-1].applicable_charges += diff
+		else:
 			frappe.throw(_("Total Applicable Charges in Purchase Receipt Items table must be same as Total Taxes and Charges"))
 
 

erpnext/stock/doctype/landed_cost_voucher/test_landed_cost_voucher.py

@@ -7,7 +7,7 @@ import unittest
 import frappe
 from frappe.utils import flt
 from erpnext.stock.doctype.purchase_receipt.test_purchase_receipt \
-	import set_perpetual_inventory, get_gl_entries, test_records as pr_test_records
+	import set_perpetual_inventory, get_gl_entries, test_records as pr_test_records, make_purchase_receipt
 from erpnext.accounts.doctype.purchase_invoice.test_purchase_invoice import make_purchase_invoice
 
 class TestLandedCostVoucher(unittest.TestCase):
@@ -133,7 +133,29 @@ class TestLandedCostVoucher(unittest.TestCase):
 
 		set_perpetual_inventory(0)
 
-def submit_landed_cost_voucher(receipt_document_type, receipt_document):
+	def test_landed_cost_voucher_for_odd_numbers (self):
+		set_perpetual_inventory(1)
+
+		pr = make_purchase_receipt(do_not_save=True)
+		pr.items[0].cost_center = "_Test Company - _TC"
+		for x in range(2):
+			pr.append("items", {
+				"item_code": "_Test Item",
+				"warehouse": "_Test Warehouse - _TC",
+				"cost_center": "_Test Company - _TC",
+				"qty": 5,
+				"rate": 50
+			})
+		pr.submit()
+
+		lcv = submit_landed_cost_voucher("Purchase Receipt", pr.name, 123.22)
+		
+		self.assertEquals(lcv.items[0].applicable_charges, 41.07)
+		self.assertEquals(lcv.items[2].applicable_charges, 41.08)		
+		
+		set_perpetual_inventory(0)
+
+def submit_landed_cost_voucher(receipt_document_type, receipt_document, charges=50):
 	ref_doc = frappe.get_doc(receipt_document_type, receipt_document)
 	
 	lcv = frappe.new_doc("Landed Cost Voucher")
@@ -151,7 +173,7 @@ def submit_landed_cost_voucher(receipt_document_type, receipt_document):
 	lcv.set("taxes", [{
 		"description": "Insurance Charges",
 		"account": "_Test Account Insurance Charges - _TC",
-		"amount": 50
+		"amount": charges
 	}])
 
 	lcv.insert()
@@ -160,10 +182,14 @@ def submit_landed_cost_voucher(receipt_document_type, receipt_document):
 	
 	lcv.submit()
 
+	return lcv
+		
 def distribute_landed_cost_on_items(lcv):
 	based_on = lcv.distribute_charges_based_on.lower()
 	total = sum([flt(d.get(based_on)) for d in lcv.get("items")])
+
 	for item in lcv.get("items"):
 		item.applicable_charges = flt(item.get(based_on)) * flt(lcv.total_taxes_and_charges) / flt(total)
+		item.applicable_charges = flt(item.applicable_charges, lcv.precision("applicable_charges", item))
 
 test_records = frappe.get_test_records('Landed Cost Voucher')