How to mark an invoice as void or uncollectible

How to mark an invoice as void or uncollectible. I am not able to change the status of the invoice to open

Thanks @first_last1 have you taken a look at this page?

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Hi,
yeah I have. I understand that an invoice can be marked as void only when the invoice is in open state but I am not able to mark the status of an invoice as open its in draft after i create it and paid after finalising it