Diagnosis
Existing records for this Infotype have been detected.

System Response
During conversion, the system expects a "blank slate" in the target
Infotype range. If records already exist for this Infotype, some
Business Logic errors/warnings which are returned during the conversion
may be misleading.
In Test mode, the Conversion program will detect existing records and
report their existence in the Message Log.
In Production mode, the Conversion program will delete any existing
Infotype records automatically, and report this deletion in the Message
Log.

Procedure
Delete the existing records and run the report again.