Can't compile stored functions in forms trigger

I have put this code in POST_QUERY trigger. But it does not compile.
select substr(wds(round(d2h(h2d(max(to_number(to_char(msg_time))))
- h2d(min(to_number(to_char(msg_time))))),2)),1,40) into :tm1 from test_hst_msg;
Please note all the fucntions are existed and are successfully compiled.
It is giving compilation error.
function 'WDS' may not be used in sql.
do you have any remeady to anyone.
Thanks.

May need to add PRAGMA RESTRICT_REFERENCES compiler directive.

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Dear All,
I am first writing a stored procedure as:-
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Dear Siree,
Oh!! how many Questions? Each how much big??
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