## Invoice Module Errors

The following errors are specific to the **Invoice** module. The `%s` in error messages are placeholders used to indicate where a specific value, such as an Invoice ID, will be inserted when the actual error message is displayed. For example, let's assume the error is “The invoice status must be `CREATED` for this operation, but was `%s`.” This error occurs when a user tries to modify an invoice that’s currently in a `PAID` status. However, the system only allows modifications when the invoice is in a `CREATED` status. This means the error would display “The invoice status must be `CREATED` for this operation, but was `PAID`.”

| Module    | Error Code  | Message                                                                                 |
|-----------|-------------|-----------------------------------------------------------------------------------------|
| **Invoice** | INVOICE-2001 | An invoice is already being processed for Order ID `%s`.                               |
| **Invoice** | INVOICE-2002 | Settlement has already been completed for this invoice.                               |
| **Invoice** | INVOICE-2003 | An invoice `%s` has already been created for this request.                             |
| **Invoice** | INVOICE-2004 | The invoice status must be ‘CREATED’ for this operation, but was `%s`.                 |
| **Invoice** | INVOICE-2005 | The invoice status must be ‘POSTED’ for this operation, but was `%s`.                  |
| **Invoice** | INVOICE-2006 | An invoice has already been created for cancellation counter `%s`.                      |
| **Invoice** | INVOICE-2007 | Unable to generate invoice: there are no items to invoice.