Fixing cust. age analysis - long standing dupe invoice (eur)

[michellepace]

Hi, we have a few long standing issues on our age analysis I'd like to iron out once and for all. One them is for a customer called OUT005. Many years ago (and I mean many years ago) we created duplicate invoice. We just never fixed it. So now the time has come.

I'm scared to simply pass a credit note on 01/03/2019 for €2,099.82 for several reasons:

• The exchange rate was different
• The invoice I need to link a CN to doesn't exist (see detailed ledger)
• Won't this CN somehow throw out all my reporting numbers?

Question:
Can anyone please advise me what is the best/cleanest way to clear out this value for my customer?