fix: reverse journal entry for multi-currency (#23165)

* fix: reverse journal entry for multi-currency

* fix: test case for reverse journal entry

erpnext/accounts/doctype/journal_entry/journal_entry.js

@@ -638,20 +638,12 @@ $.extend(erpnext.journal_entry, {
 		return { filters: filters };
 	},
 
-	reverse_journal_entry: function(frm) {
-		var me = frm.doc;
-		for(var i=0; i<me.accounts.length; i++) {
-			me.accounts[i].credit += me.accounts[i].debit;
-			me.accounts[i].debit = me.accounts[i].credit - me.accounts[i].debit;
-			me.accounts[i].credit -= me.accounts[i].debit;
-			me.accounts[i].credit_in_account_currency = me.accounts[i].credit;
-			me.accounts[i].debit_in_account_currency = me.accounts[i].debit;
-			me.accounts[i].reference_type = "Journal Entry";
-			me.accounts[i].reference_name = me.name
-		}
-		frm.copy_doc();
-		cur_frm.reload_doc();
-	}
+	reverse_journal_entry: function() {
+		frappe.model.open_mapped_doc({
+			method: "erpnext.accounts.doctype.journal_entry.journal_entry.make_reverse_journal_entry",
+			frm: cur_frm
+		})
+	},
 });
 
 $.extend(erpnext.journal_entry, {

erpnext/accounts/doctype/journal_entry/journal_entry.py

@@ -1021,3 +1021,34 @@ def make_inter_company_journal_entry(name, voucher_type, company):
 	journal_entry.posting_date = nowdate()
 	journal_entry.inter_company_journal_entry_reference = name
 	return journal_entry.as_dict()
+
+@frappe.whitelist()
+def make_reverse_journal_entry(source_name, target_doc=None, ignore_permissions=False):
+	from frappe.model.mapper import get_mapped_doc
+
+	def update_accounts(source, target, source_parent):
+		target.reference_type = "Journal Entry"
+		target.reference_name = source_parent.name
+
+	doclist = get_mapped_doc("Journal Entry", source_name, {
+		"Journal Entry": {
+			"doctype": "Journal Entry",
+			"validation": {
+				"docstatus": ["=", 1]
+			}
+		},
+		"Journal Entry Account": {
+			"doctype": "Journal Entry Account",
+			"field_map": {
+				"account_currency": "account_currency",
+				"exchange_rate": "exchange_rate",
+				"debit_in_account_currency": "credit_in_account_currency",
+				"debit": "credit",
+				"credit_in_account_currency": "debit_in_account_currency",
+				"credit": "debit",
+			},
+			"postprocess": update_accounts,
+		},
+	}, target_doc, ignore_permissions=ignore_permissions)
+
+	return doclist

erpnext/accounts/doctype/journal_entry/test_journal_entry.py

@@ -167,6 +167,49 @@ class TestJournalEntry(unittest.TestCase):
 
 		self.assertFalse(gle)
 
+	def test_reverse_journal_entry(self):
+		from erpnext.accounts.doctype.journal_entry.journal_entry import make_reverse_journal_entry 
+		jv = make_journal_entry("_Test Bank USD - _TC",
+			"Sales - _TC", 100, exchange_rate=50, save=False)
+
+		jv.get("accounts")[1].credit_in_account_currency = 5000
+		jv.get("accounts")[1].exchange_rate = 1
+		jv.submit()
+
+		rjv = make_reverse_journal_entry(jv.name)
+		rjv.posting_date = nowdate()
+		rjv.submit()
+
+
+		gl_entries = frappe.db.sql("""select account, account_currency, debit, credit,
+			debit_in_account_currency, credit_in_account_currency
+			from `tabGL Entry` where voucher_type='Journal Entry' and voucher_no=%s
+			order by account asc""", rjv.name, as_dict=1)
+
+		self.assertTrue(gl_entries)
+
+
+		expected_values = {
+			"_Test Bank USD - _TC": {
+				"account_currency": "USD",
+				"debit": 0,
+				"debit_in_account_currency": 0,
+				"credit": 5000,
+				"credit_in_account_currency": 100,
+			},
+			"Sales - _TC": {
+				"account_currency": "INR",
+				"debit": 5000,
+				"debit_in_account_currency": 5000,
+				"credit": 0,
+				"credit_in_account_currency": 0,
+			}
+		}
+
+		for field in ("account_currency", "debit", "debit_in_account_currency", "credit", "credit_in_account_currency"):
+			for i, gle in enumerate(gl_entries):
+				self.assertEqual(expected_values[gle.account][field], gle[field])
+
 	def test_disallow_change_in_account_currency_for_a_party(self):
 		# create jv in USD
 		jv = make_journal_entry("_Test Bank USD - _TC",