Dear Seller,
As per a notification by CBEC on 27th Feb 2019 - AD (Authorized Dealer) Code has been made mandatory for shipping through CSB (Courier Shipping Bill) V. This new regulation is applicable with immediate effect.
For a more detailed understanding of the notifications, please click on the links below:
To make this change easier for you, we have incorporated an additional field in our CSB V tool. You simply need to fill the AD Code (as an additional field) in your user profile & generate the Air Way Bill (AWB).This feature is currently live with the Logistic Provider DHL Express .The AD code will be mentioned in the Invoice once you book a shipment. PFB screenshot –

In case of any queries please contact your Account Manager / Team eBay Global Shipping.
Thanks & Regards,
Team eBay Global Shipping