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Error Stack 
A request-based table into which the incorrect data records from a data transfer process are written.
At run time, the incorrect data records are written into an error stack if the error handling for the data transfer process has been activated. You use the error stack to post the data to the target destination once the error has been removed.
In the monitor for the data transfer process you can branch to PSA maintenance by choosing Error Stack in the toolbar and display and edit the records with errors in the error stack.
With an error DTP, you can post the data records manually or by means of a process chain to the target. Once the data records have been successfully posted, they are deleted from the error stack.
If a request is deleted in a DataStore object, the associated data records are also deleted in the error stack.