fix: Total calculations for multicurrency RCM invoices (#23072)

diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index fe7e0c8..2c81748 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 import frappe, re, json
 from frappe import _
+import erpnext
 from frappe.utils import cstr, flt, date_diff, nowdate, round_based_on_smallest_currency_fraction, money_in_words
 from erpnext.regional.india import states, state_numbers
 from erpnext.controllers.taxes_and_totals import get_itemised_tax, get_itemised_taxable_amount
@@ -678,20 +679,26 @@
 		gst_account_list = gst_accounts.get('cgst_account') + gst_accounts.get('sgst_account') \
 			+ gst_accounts.get('igst_account')
 
+		base_gst_tax = 0
 		gst_tax = 0
+
 		for tax in doc.get('taxes'):
 			if tax.category not in ("Total", "Valuation and Total"):
 				continue
 
 			if flt(tax.base_tax_amount_after_discount_amount) and tax.account_head in gst_account_list:
-				gst_tax += tax.base_tax_amount_after_discount_amount
+				base_gst_tax += tax.base_tax_amount_after_discount_amount
+				gst_tax += tax.tax_amount_after_discount_amount
 
 		doc.taxes_and_charges_added -= gst_tax
 		doc.total_taxes_and_charges -= gst_tax
+		doc.base_taxes_and_charges_added -= base_gst_tax
+		doc.base_total_taxes_and_charges -= base_gst_tax
 
-		update_totals(gst_tax, doc)
+		update_totals(gst_tax, base_gst_tax, doc)
 
-def update_totals(gst_tax, doc):
+def update_totals(gst_tax, base_gst_tax, doc):
+	doc.base_grand_total -= base_gst_tax
 	doc.grand_total -= gst_tax
 
 	if doc.meta.get_field("rounded_total"):
@@ -707,6 +714,7 @@
 			doc.outstanding_amount = doc.rounded_total or doc.grand_total
 
 	doc.in_words = money_in_words(doc.grand_total, doc.currency)
+	doc.base_in_words = money_in_words(doc.base_grand_total, erpnext.get_company_currency(doc.company))
 	doc.set_payment_schedule()
 
 def make_regional_gl_entries(gl_entries, doc):