How to delete/revise an invoice in 2014?

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Hi,

I am having trouble deleting an invoice in 2014.
A purchasing department person created one invoice(A) with PO last year so did I(B) last year.
So, the invoice A remains on Accounts payable report this year.

However, our company closed our last year report a couple months ago. 
Is there any way to edit these invoices?

Thank you for your advice!