If, while the system is processing an IDoc, a logical error occurs whose cause is in article maintenance, the system cancels the corresponding maintenance transaction and gives the IDoc the status incorrect. If no logical errors occur, it is given the status successful.
For IDocs with the status incorrect or successful, you can view in the application log the messages issued during processing of the IDoc. After resolving the cause of the logical error, you can repost the incorrect IDocs.
For information on troubleshooting and the recovery of technical errors, see the SAP library documentation on ALE. Error localization is primarily a question of checking the settings made in Customizing for Distribution (ALE).