Too many levels of naming used without multischema

  Explanation:  The user entered the name of an object which was
  qualified with too many names.  When multischema is disabled
  (the default), table names may be qualified only by a schema
  name; column names may be qualified only by a schema and table
  name.

  User Action:  In order to qualify a schema name, table name or
  column name with an additonal name for the catalog, multischema
  must be enabled using the MULTISCHEMA compiler option or the SET
  MULTISCHEMA statement in interactive or dynamic.