diff --git a/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json b/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
index 68ed3391d04..16b29633010 100644
--- a/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
+++ b/erpnext/regional/doctype/e_invoice_settings/e_invoice_settings.json
@@ -10,6 +10,10 @@
   "sandbox_mode",
   "applicable_from",
   "credentials",
+  "advanced_settings_section",
+  "client_id",
+  "column_break_8",
+  "client_secret",
   "auth_token",
   "token_expiry"
  ],
@@ -56,12 +60,32 @@
    "in_list_view": 1,
    "label": "Applicable From",
    "reqd": 1
+  },
+  {
+   "collapsible": 1,
+   "fieldname": "advanced_settings_section",
+   "fieldtype": "Section Break",
+   "label": "Advanced Settings"
+  },
+  {
+   "fieldname": "client_id",
+   "fieldtype": "Data",
+   "label": "Client ID"
+  },
+  {
+   "fieldname": "client_secret",
+   "fieldtype": "Password",
+   "label": "Client Secret"
+  },
+  {
+   "fieldname": "column_break_8",
+   "fieldtype": "Column Break"
   }
  ],
  "index_web_pages_for_search": 1,
  "issingle": 1,
  "links": [],
- "modified": "2021-03-30 12:26:25.538294",
+ "modified": "2021-11-16 19:50:28.029517",
  "modified_by": "Administrator",
  "module": "Regional",
  "name": "E Invoice Settings",
diff --git a/erpnext/regional/india/e_invoice/utils.py b/erpnext/regional/india/e_invoice/utils.py
index b0b40758ab0..1e329d41702 100644
--- a/erpnext/regional/india/e_invoice/utils.py
+++ b/erpnext/regional/india/e_invoice/utils.py
@@ -151,6 +151,10 @@ def validate_address_fields(address, skip_gstin_validation):
 			title=_('Missing Address Fields')
 		)
 
+	if address.address_line2 and len(address.address_line2) < 2:
+		# to prevent "The field Address 2 must be a string with a minimum length of 3 and a maximum length of 100"
+		address.address_line2 = ""
+
 def get_party_details(address_name, skip_gstin_validation=False):
 	addr = frappe.get_doc('Address', address_name)
 
@@ -402,6 +406,12 @@ def validate_totals(einvoice):
 	if abs(flt(value_details['AssVal']) - total_item_ass_value) > 1:
 		frappe.throw(_('Total Taxable Value of the items is not equal to the Invoice Net Total. Please check item taxes / discounts for any correction.'))
 
+	if abs(flt(value_details['CgstVal']) + flt(value_details['SgstVal']) - total_item_cgst_value - total_item_sgst_value) > 1:
+		frappe.throw(_('CGST + SGST value of the items is not equal to total CGST + SGST value. Please review taxes for any correction.'))
+
+	if abs(flt(value_details['IgstVal']) - total_item_igst_value) > 1:
+		frappe.throw(_('IGST value of all items is not equal to total IGST value. Please review taxes for any correction.'))
+
 	if abs(flt(value_details['TotInvVal']) + flt(value_details['Discount']) - flt(value_details['OthChrg']) - total_item_value) > 1:
 		frappe.throw(_('Total Value of the items is not equal to the Invoice Grand Total. Please check item taxes / discounts for any correction.'))
 
@@ -475,7 +485,11 @@ def make_einvoice(invoice):
 	except Exception:
 		show_link_to_error_log(invoice, einvoice)
 
-	validate_totals(einvoice)
+	try:
+		validate_totals(einvoice)
+	except Exception:
+		log_error(einvoice)
+		raise
 
 	return einvoice
 
@@ -629,9 +643,11 @@ class GSPConnector():
 		frappe.db.commit()
 
 	def fetch_auth_token(self):
+		client_id = self.e_invoice_settings.client_id or frappe.conf.einvoice_client_id
+		client_secret = self.e_invoice_settings.get_password('client_secret') or frappe.conf.einvoice_client_secret
 		headers = {
-			'gspappid': frappe.conf.einvoice_client_id,
-			'gspappsecret': frappe.conf.einvoice_client_secret
+			'gspappid': client_id,
+			'gspappsecret': client_secret
 		}
 		res = {}
 		try:
@@ -936,7 +952,7 @@ class GSPConnector():
 		if errors:
 			frappe.throw(errors, title=title, as_list=1)
 		else:
-			link_to_error_list = '<a href="/app/error-log">Error Log</a>'
+			link_to_error_list = '<a href="/app/error-log" target="_blank">Error Log</a>'
 			frappe.msgprint(
 				_('An error occurred while making e-invoicing request. Please check {} for more information.').format(link_to_error_list),
 				title=title,