Hi Lusanda

You can pass a credit memo linking it to the duplicate invoice

Hello Andrew, 

There's no delete or reverse option?

Hi Lusanda

You can cancel the transaction using the the Accounting cancelation function assuming the invoice is posted.

Follow the steps numbered 1 & 2 above to cancel 

Hi Lusanda

You can cancel the transaction using the the Accounting cancelation function assuming the invoice is posted.

Follow the steps numbered 1 & 2 above to cancel