diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index 6164e06..5458001 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -516,6 +516,9 @@
 		data.transType = 1
 		data.actualToStateCode = data.toStateCode
 		shipping_address = billing_address
+	
+	if doc.gst_category == 'SEZ':
+		data.toStateCode = 99
 
 	return data