How can I resend a failed or rejected invoice with the same invoice number

By default, the SAP Business Network does not allow duplicate invoice numbers, so you cannot resend invoices in Failed or Rejected
If you receive the error Invoice or Credit Memo # already exists.,you have to change the invoice number.

However, your customer can change this default setting to let you reuse invoice numbers for invoices in Canceled, Failed, or Rejected statuses. You can check your customer's invoicing rules in your account to see if your customer allows this.

SAP Business Network for Procurement & Supply Chain