SAP Message VSB249 - No valid self-billing display type key in IDoc

Diagnosis
An incorrect value for determining the credit memo type was transferredin the IDoc in the segment/field E1EDKo1/ACTION.

Procedure
You can enter a valid value with the function . Thefollowing values are currently supported:
005 Normal credit memo display
006 Clearing invoice (after retroactive price change)
007 Non-valued goods receipt
For reasons of compatibility, values 000 (same meaning as 005), and 001(same meaning as 006) are supported. However, you should only use thosevalues listed above, that is 005, 006 or 007.
For value 007, the system assumes that data transferred is forinformation purposes only. The data record is deactivated as far as theprogram is concerned. Processing in the processing step is completed. Amanual change of the deactivtaion is not possible.