E Invoicing error:2246 : Recepient cannot be SEZ for - B2B transaction for document no 90179780

Hi Guys,

While we are trying to generate IRN for the SD document i am facing the error as

2246 : Recepient cannot be SEZ for - B2B transaction for document no 90179780

It is not allowing me to create IRN document

our customer is using GST number which represent SEZ

but according to law it should allow to IRN to be created if GST number is for SEZ developer

I dont know whether our customer is SEZ developer or SEZ unit, is their a way to find out if the customer is SEZ unit or SEZ developer