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Use
In the verification step, the system reads the customer transmission, verifies the data and uses it to determine the corresponding data in the SAP system.
Integration
Data that has been read and set as without errors in the verification step is ready to proceed to the processing step. There, the system compares the quantities and values in the self-billing document with the quantities and values in the current billing document. The system always updates the reference number in the current SD and FI billing documents. In the case of value differences, the system automatically carries out clearing postings.
Features

The number for delivery determination might be the delivery number from the supplier's own system, or any number with which the delivery can be uniquely identified (for example, an ESA delivery number). You make these settings in the Self-Billing Monitor under Settings ®
Maintain Sold-To Party Parameters.
If the system finds no corresponding SAP delivery, the verification step reports an error in delivery determination.
Result
When the transmission is ended or the processing step is started, the next inbound IDoc automatically causes a new transmission for the EDI partner to be created. This and any subsequent IDocs remain in the verification step until the transmission is again ended, or the processing step is started for the transmission.
In the Self-Billing Monitor a counter indicates, whether errors have occurred during the verification step (such as no delivery being found in the SAP system, or a similar assignment error). By double-clicking on this number, you can display the long text of the error message.

If you double-click on the long text, the system will display detailed information on the cause of the problem and how to deal with it.
Either:
