Regarding debit credit notes in gst

Do i have to enter that bill in my purchase register?

Because before rolling of e way bill, one of my supplier generated a bill of my name and i came to know about that after six months as i have asked him for account statement.

for the current bill it's all fine but what about the bill which was generated six months ago?

and i won't be able to take input tax credit on that amount , right sir?

Thank you so much sir.

I think i have done with my query.

Once again , thanks for your valuable comments.