If you use SFPT to upload your invoices through CSV, you can view processing errors for a specific customer by going to Admin > SFTP Errors and selecting the customer from the drop-down list.
Click the file name links to download and view the .csv files.
Click the links in the Upload Errors column to see the detailed error messages. Successful file uploads are listed without the Click for Errors link.
For more information, see Create SFTP Accounts.