Credit Note without tax

I THINK YOU CAN TAKE 

Hi, @ Santhu amma., 
I Just clear all accounting , First you have clear these things from supplier

• Check with supplier , they have record  said invoice in GSTR -I
• Tax has been deposit by supplier
• Payment has been made angst the said invoice if any, advance

Please confirm , will give you positve response

Supplier giving you discount for damage materials which will not to be return to supplier. and you also not issuing sales return invoice , So you can get that CN as  total discount amount.