Compare two dates in page validation

APEX 3.0.1, RDBMS 10GR2
I am new to APEX.
In my region, I have several items, two of which are start date and final date generated from a date picker (calendar). I would like to build a simple validation that insures that the start date is not greater than the final date.
I created a page validation (type = SQL expression), with validation expression 1 as:
to_date(P21_SUBD_START_DATE_DATE,'DD-MM-YYYY') >
to_date(P21_SUBD_FINAL_DATE,'DD-MM-YYYY')
and the system returns the following error message:
ORA-06503: PL/SQL: Function returned without value
ERR-1023 Unable perform validations.
Any ideas on how I can enforce validation that insures that the start date is not greater than the final date or insight into this error is appreciated.
Thanks in advance.
Barry D.

Figured it out. In case anyone else runs into this problem I used:
Type = PL/SQL Expression, with Validation Expression 1 as:
to_date(:P21_SUBD_PERL_DATE,'MM/DD/YYYY') < to_date(:P21_SUBD_FINAL_DATE,'MM/DD/YYYY')
Barry D.

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