"CANNOT VOID INVOICE.  You can void only invoices that have not had any adjustment activity."

Void a Vendor invoice using a credit memo

1. Browse to AP, Invoices, Credit Memos.
2. Select the Vendor Id.
3. For Apply to, select Invoices.
4. Select the invoice number.
5. Enter the Date for the Credit Memo (Generally the same date as the invoice date).
6. Enter the Amount of the invoice.
7. Select the same General Ledger account number debited on the original invoice.
8. Post.

Void a negative Vendor invoice by performing a debit memo

1. Select AP, Invoices, Debit Memos.
2. Select the Vendor Id.
3. For Apply to, select Invoices.
4. Select the invoice number.
5. Enter the Date for the Debit Memo (Generally the same date as the invoice date).
6. Enter the Amount of the invoice.
7. Select the same General Ledger account number credited on the original negative invoice.
8. Post the debit memo.

Void an Accounts Payable vendor invoice or invoice credit