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Testing Reversals of Billing
Documents 
With a report that you create using sample report IST_SAMPLE_CANCEL_BILLDOC as a template, you can test the reversal of billing documents in a test system.
The sample report calls the BAPI BAPI_ISTBILLDOC_CANCEL and reverses a billing document without reference to a reversal document from an external system. Such a reversal would be an error in a productive system and would destroy the consistency of the external documents and the documents in the SAP system. Therefore, report IST_SAMPLE_CANCEL_BILLDOC terminates the run immediately.
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1. If required, copy the report IST_SAMPLE_CANCEL_BILLDOC.
2. Remove the coding lines that call the termination.
3. Make sure that the report is only run in a test system.
Report IST_SAMPLE_CANCEL_BILLDOC uses a GUID for the reference document number of the reversal document (field REFDOCNO in structure FKKINVBILL_H).