GST set-off on Goods return after 15 months

Need help on below scenario -
Manufacturer A sells items to Dealer B on 1st Aug 2017
Dute to item expiry date the goods are returned to manufacturer in Dec 2018 ( after 15 months)
In this scenario can Dealer raise a sales invoice and send the goods back?

Asking this since there is a 6 month time frame limit for issuing credit note from manufacturer side

Can principal manucturer account as purchase of its own manufactured goods in order to avoid GST loss?