fix: Validate for deferred revenue only if sales invoice needs repost

erpnext/accounts/doctype/sales_invoice/sales_invoice.py

@@ -571,6 +571,7 @@ class SalesInvoice(SellingController):
 
 			# validate if deferred revenue is enabled for any item
 			# Don't allow to update the invoice if deferred revenue is enabled
+			if needs_repost:
 				for item in self.get("items"):
 					if item.enable_deferred_revenue:
 						frappe.throw(