How to handle more than 4000 characters in Webi

HI,

Can someone advise how to handle more than 4000 characters in Webi.

object at DB is defined as Varchar2 and at Webi as Character.

few values in column has more than 4000 characters and throws database error "Error - ORA-22835: Buffer too small for CLOB to CHAR or BLOB to RAW conversion"

BOXI 3.1 version

THanks,

RAm