[Question] Help with a duplicated invoice

[LSP2008]

I processed a supplier invoice - something has gone wrong and the invoice is duplicated. Already updated batch
I followed a discussion on the forum and tried to do a credit note - keeps telling me cant find code.....please can someone help.
I am desperate to sort out

[Mike C]

A supplier invoice has to be reversed by doing a Return Debit. On the second line use Type 7 (Remarks) to make a comment reminding you why the Invoice was reversed.

[LSP2008]

A supplier invoice has to be reversed by doing a Return Debit. On the second line use Type 7 (Remarks) to make a comment reminding you why the Invoice was reversed.

Thank you - will give this a bash !!