CWLAE0104W The index on key attributes cannot be created.

Explanation
A likely cause of this error is that the total length of the key attributes columns is too long. Database management systems (DBMS) have a limitation on the total length of all of the indexed columns in one COMPOSITE index. For example, the limitation is 1024 bytes for DB2 Universal Database, v8 (Windows/Linux/UNIX), and 380 bytes for Informix Dynamic Server, v9.4.
User response
If there are several key attributes whose type is string, set a maximum length in the business object attributes.