ORACLE CLOB data type and WIS 10901

Hello! I have several objects in universe that has connection to ORACLE DB. One of them has type CLOB in db and Long Text in universe, other has type number and has definition COUNT(db_column).
When I'm using this objects separate in webi query - everything fine, but when I put them together I've got error message:
A database error occured. The database error text is: ORA-00932: inconsistent datatypes: expected - , got CLOB
. (WIS 10901)
What's going wrong?

I''ve got a solution! I've had sql in my query
SELECT
  ltrim(OPERATIVE_REPORT."orderText",11),
  OPERATIVE_REPORT."resolID",
  COUNT(OPERATIVE_REPORT."(usrID)order_executionUser")
FROM
  OPERATIVE_REPORT
GROUP BY
  ltrim(OPERATIVE_REPORT."orderText",11),
  OPERATIVE_REPORT."resolID"
where orderText has clob datatype. And the reason is GROUP BY. GROUP BY deny CLOB usage.

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