SAP Message CACSIS305 - Incorrect source structure &1

Diagnosis
A system error has occurred. The function module CACS_GEN_REPTYPE isbeing used incorrectly. The parameter I_REPTYPE_FR only allows the DDICstructures CACS00_SIS_* as original report types.
Also, these structure must already be in use for drilldown reports andthey must already exist in the view V_TRKB1U under the key 'CACS' and.

System Response
Drilldown report type is not generated.
INCLUDE ISIS_OSS OBJECT DOKU ID TX
Inform SAP. This error should not occur with a customer.

Procedure for System Administration
The function module is to be called by the generating program only andnever by the customer.