feat: Generate & Cancel IRN from Sales Invoice

erpnext/controllers/accounts_controller.py

@@ -108,8 +108,14 @@ class AccountsController(TransactionBase):
 				self.validate_deferred_start_and_end_date()
 
 		validate_regional(self)
+		
+		validate_einvoice_fields(self)
+
 		if self.doctype != 'Material Request':
 			apply_pricing_rule_on_transaction(self)
+	
+	def before_cancel(self):
+		validate_einvoice_fields(self)
 
 	def validate_deferred_start_and_end_date(self):
 		for d in self.items:
@@ -1423,3 +1429,7 @@ def update_child_qty_rate(parent_doctype, trans_items, parent_doctype_name, chil
 @erpnext.allow_regional
 def validate_regional(doc):
 	pass
+
+@erpnext.allow_regional
+def validate_einvoice_fields(doc):
+	pass