fix: auto append_taxes_from_item_tax_template in backend

(cherry picked from commit 4cb1fa2b6b)

# Conflicts:
#	erpnext/controllers/accounts_controller.py
#	erpnext/controllers/tests/test_accounts_controller.py

erpnext/accounts/doctype/accounts_settings/accounts_settings.js

@@ -22,4 +22,21 @@ frappe.ui.form.on("Accounts Settings", {
 			}
 		);
 	},
+
+	add_taxes_from_taxes_and_charges_template(frm) {
+		toggle_tax_settings(frm, "add_taxes_from_taxes_and_charges_template");
+	},
+	add_taxes_from_item_tax_template(frm) {
+		toggle_tax_settings(frm, "add_taxes_from_item_tax_template");
+	},
 });
+
+function toggle_tax_settings(frm, field_name) {
+	if (frm.doc[field_name]) {
+		const other_field =
+			field_name === "add_taxes_from_item_tax_template"
+				? "add_taxes_from_taxes_and_charges_template"
+				: "add_taxes_from_item_tax_template";
+		frm.set_value(other_field, 0);
+	}
+}

erpnext/accounts/doctype/accounts_settings/accounts_settings.json

@@ -31,6 +31,7 @@
   "determine_address_tax_category_from",
   "column_break_19",
   "add_taxes_from_item_tax_template",
+  "add_taxes_from_taxes_and_charges_template",
   "book_tax_discount_loss",
   "round_row_wise_tax",
   "print_settings",
@@ -601,6 +602,13 @@
    "fieldname": "allow_pegged_currencies_exchange_rates",
    "fieldtype": "Check",
    "label": "Allow Implicit Pegged Currency Conversion"
+  },
+  {
+   "default": "0",
+   "description": "If no taxes are set, and Taxes and Charges Template is selected, the system will automatically apply the taxes from the chosen template.",
+   "fieldname": "add_taxes_from_taxes_and_charges_template",
+   "fieldtype": "Check",
+   "label": "Automatically Add Taxes from Taxes and Charges Template"
   }
  ],
  "icon": "icon-cog",

erpnext/accounts/doctype/accounts_settings/accounts_settings.py

@@ -25,6 +25,7 @@ class AccountsSettings(Document):
 
 		acc_frozen_upto: DF.Date | None
 		add_taxes_from_item_tax_template: DF.Check
+		add_taxes_from_taxes_and_charges_template: DF.Check
 		allow_multi_currency_invoices_against_single_party_account: DF.Check
 		allow_pegged_currencies_exchange_rates: DF.Check
 		allow_stale: DF.Check
@@ -74,6 +75,7 @@ class AccountsSettings(Document):
 	# end: auto-generated types
 
 	def validate(self):
+		self.validate_auto_tax_settings()
 		old_doc = self.get_doc_before_save()
 		clear_cache = False
 
@@ -140,3 +142,13 @@ class AccountsSettings(Document):
 		if self.has_value_changed("reconciliation_queue_size"):
 			if cint(self.reconciliation_queue_size) < 5 or cint(self.reconciliation_queue_size) > 100:
 				frappe.throw(_("Queue Size should be between 5 and 100"))
+
+	def validate_auto_tax_settings(self):
+		if self.add_taxes_from_item_tax_template and self.add_taxes_from_taxes_and_charges_template:
+			frappe.throw(
+				_("You cannot enable both the settings '{0}' and '{1}'.").format(
+					frappe.bold(self.meta.get_label("add_taxes_from_item_tax_template")),
+					frappe.bold(self.meta.get_label("add_taxes_from_taxes_and_charges_template")),
+				),
+				title=_("Auto Tax Settings Error"),
+			)

erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py

@@ -836,6 +836,10 @@ class TestSalesInvoice(FrappeTestCase):
 		w = self.make()
 		self.assertEqual(w.outstanding_amount, w.base_rounded_total)
 
+	@IntegrationTestCase.change_settings(
+		"Accounts Settings",
+		{"add_taxes_from_item_tax_template": 0, "add_taxes_from_taxes_and_charges_template": 0},
+	)
 	def test_rounded_total_with_cash_discount(self):
 		si = frappe.copy_doc(test_records[2])