Rejection pre and post gst

Avishek Mukherjee (37 Points)

23 November 2018  
Goods sold 11.5.17 ( pre gst)but material rejected by party as 20.11.18 and materials returned after 1.5 ye. (post gst)

Please help that is the next prosidure, we will provide credit note or party will provide sale invoice.

Thanks in advance