If you have used a date in a future year during your Invoice entry by error, then you have post-dated the transaction.
To correct the entry and post it to the current year you will need to do the following:
Enter a Supplier Credit Note with the same Future date as the incorrectly dated invoice:
Go to Suppliers, then Transactions, then Credit Adjustment Notes then click Create.
Use the same date that was used on the post-dated Invoice.
Allocate the post-dated credit note to the post-dated invoice.
Re-enter the supplier invoice with the correct date that falls in the current year:
Go to Suppliers, then Transactions, then Invoices then click Create.
Use the correct date for the invoice that falls in the current year.
Add Lines as necessary.
Accept(F9) to save the invoice.
Note: Refer to this article for more information on How to Reverse a Supplier Invoice.