Cause: The policy function may have been
dropped, or is no longer valid.
Action: Check the status of the function
and correct the problem. Or re-create the policy with a valid
function.

Relared Errors:
ORA-28111:
insufficient privilege to evaluate policy predicate
ORA-28112:
failed to execute policy function
ORA-28113:
policy predicate has error
ORA-28115:
policy with check option violation
ORA-28116:
insufficient privileges to do direct path access
ORA-28117:
integrity constraint violated - parent record not found
ORA-28118:
policy group already exists
ORA-28119:
policy group does not exist
ORA-28120:
driving context already exists
ORA-28121:
driving context does not exist