a database name is not allowed in a qualified host variable

  Explanation:  You cannot use a database field name to qualify  a
  host  variable.   For  example,  you  cannot  have the following
  expression:   FOR  E   IN   EMPLOYEES   WITH   E.EMPLOYEE_ID   =
  HOST_VAR(E.EMPLOYEE_ID) ~.~.~.

  User Action:  Use an additional  GET  statement  to  assign  the
  value  of  the  database  field to another host variable and use
  that host variable to qualify  the  first  host  variable.   For
  example,  FOR  E IN EMPLOYEES GET HOST-VAR-2 = E.EMPLOYEE_ID FOR
  E1 IN EMPLOYEES WITH E.EMPLOYEE_ID = HOST-VAR(HOST-VAR-2) ~.~.~.
  END_FOR END_FOR