fix(purchase_register): filter tax rows by parenttype in invoice tax map query (backport #54272) (#54444)

fix(purchase_register): filter tax rows by parenttype in invoice tax map query

(cherry picked from commit 3aeb7d6b01)

Co-authored-by: ljain112 <ljain112@gmail.com>

erpnext/accounts/report/purchase_register/purchase_register.py

@@ -499,7 +499,7 @@ def get_invoice_tax_map(invoice_list, invoice_expense_map, expense_accounts, inc
 		else sum(base_tax_amount_after_discount_amount) * -1 end as tax_amount
 		from `tabPurchase Taxes and Charges`
 		where parent in (%s) and category in ('Total', 'Valuation and Total')
-			and base_tax_amount_after_discount_amount != 0
+			and base_tax_amount_after_discount_amount != 0 and parenttype='Purchase Invoice'
 		group by parent, account_head, add_deduct_tax
 	"""
 		% ", ".join(["%s"] * len(invoice_list)),

erpnext/accounts/report/purchase_register/test_purchase_register.py

@@ -5,6 +5,7 @@ import frappe
 from frappe.utils import add_months, today
 
 from erpnext.accounts.report.purchase_register.purchase_register import execute
+from erpnext.stock.doctype.purchase_receipt.test_purchase_receipt import make_purchase_receipt
 from erpnext.tests.utils import ERPNextTestSuite
 
 
@@ -26,6 +27,52 @@ class TestPurchaseRegister(ERPNextTestSuite):
 		self.assertEqual(first_row.total_tax, 100)
 		self.assertEqual(first_row.grand_total, 1100)
 
+	def test_purchase_register_ignores_tax_rows_from_other_doctype(self):
+		frappe.db.sql("delete from `tabPurchase Invoice` where company='_Test Company 6'")
+		frappe.db.sql("delete from `tabGL Entry` where company='_Test Company 6'")
+
+		filters = frappe._dict(company="_Test Company 6", from_date=add_months(today(), -1), to_date=today())
+
+		pi = make_purchase_invoice()
+
+		# Real workflow setup: create a Purchase Receipt tax row in the same shared child table.
+		pr = make_purchase_receipt(
+			company="_Test Company 6",
+			supplier="_Test Supplier",
+			item="_Test Item",
+			warehouse="_Test Warehouse - _TC6",
+			cost_center="_Test Cost Center - _TC6",
+			do_not_save=1,
+			do_not_submit=1,
+			qty=1,
+			rate=1000,
+		)
+		pr.append(
+			"taxes",
+			{
+				"account_head": "GST - _TC6",
+				"cost_center": "_Test Cost Center - _TC6",
+				"add_deduct_tax": "Add",
+				"category": "Valuation and Total",
+				"charge_type": "Actual",
+				"description": "PR Tax",
+				"tax_amount": 100.0,
+				"rate": 100,
+			},
+		)
+		pr.insert()
+		pr.submit()
+
+		# Mimic custom naming collision across doctypes (same parent value in shared child table).
+		frappe.rename_doc("Purchase Receipt", pr.name, pi.name, force=True)
+
+		report_results = execute(filters)
+		first_row = frappe._dict(report_results[1][0])
+
+		self.assertEqual(first_row.voucher_no, pi.name)
+		self.assertEqual(first_row.total_tax, 100)
+		self.assertEqual(first_row.grand_total, 1100)
+
 	def test_purchase_register_ledger_view(self):
 		frappe.db.sql("delete from `tabPurchase Invoice` where company='_Test Company 6'")
 		frappe.db.sql("delete from `tabGL Entry` where company='_Test Company 6'")

erpnext/accounts/report/sales_register/test_sales_register.py

@@ -4,6 +4,7 @@ from frappe.utils import getdate, today
 from erpnext.accounts.doctype.sales_invoice.test_sales_invoice import create_sales_invoice
 from erpnext.accounts.report.sales_register.sales_register import execute
 from erpnext.accounts.test.accounts_mixin import AccountsTestMixin
+from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
 from erpnext.tests.utils import ERPNextTestSuite
 
 
@@ -72,6 +73,43 @@ class TestItemWiseSalesRegister(ERPNextTestSuite, AccountsTestMixin):
 		report_output = {k: v for k, v in report[1][0].items() if k in expected_result}
 		self.assertDictEqual(report_output, expected_result)
 
+	def test_sales_register_ignores_tax_rows_from_other_doctype(self):
+		si = self.create_sales_invoice(rate=98)
+
+		# Real workflow setup: create a Sales Order with taxes in the shared child table.
+		so = make_sales_order(
+			item=self.item,
+			company=self.company,
+			customer=self.customer,
+			rate=77,
+			do_not_save=1,
+			do_not_submit=1,
+		)
+		so.append(
+			"taxes",
+			{
+				"charge_type": "Actual",
+				"account_head": self.income_account,
+				"description": "SO Tax",
+				"tax_amount": 55.0,
+			},
+		)
+		so.insert()
+		so.submit()
+
+		# Mimic custom naming collision across doctypes (same parent value in shared child table).
+		frappe.rename_doc("Sales Order", so.name, si.name, force=True)
+
+		filters = frappe._dict({"from_date": today(), "to_date": today(), "company": self.company})
+		report = execute(filters)
+
+		self.assertEqual(len(report[1]), 1)
+		result = frappe._dict(report[1][0])
+		self.assertEqual(result.voucher_no, si.name)
+		self.assertEqual(result.net_total, 98.0)
+		self.assertEqual(result.tax_total, 0)
+		self.assertEqual(result.grand_total, 98.0)
+
 	def test_journal_with_cost_center_filter(self):
 		je1 = frappe.get_doc(
 			{