Validation of attribute in Entity Object with List Rule Type

hi all
I have an entity "currncy" and I want to make
a validation in entity level on its attribute "Isdefaultcurrency"
which is boolean.
Entity Object : Currency
attributes :
1. Currencyid DBsequence
2. Currencyname String
3. Isdefaultcurrency, Boolean, CheckBox
Rule Type : List
Operator : In
List Type : Query Result 'select ISDEFAULTCURRENCY from currency where ISDEFAULTCURRENCY=1'
I want when user insert in table, validation checks the attribute 'Isdefaultcurrency'
was true then show the error message that there was default currency and if you
want to set it to true (or default) you must change another record that was true
and uncheck it then back to current record and will make it true and
there is one record in my table that its attribute 'Isdefaultcurrency' must be true
this validation that I used , it does not work correctly and it allows to enter 2 records with
true value for Isdefaultcurrency. In fact I want when User Enter the First record and
set the Isdefaultcurrency to true then enter the second record and set the Isdefaultcurrency
to true the error message will be shown.
pleas explain it
Edited by: Marzieh on Jan 30, 2012 9:43 PM

Is it that you want to only allow one record in the table to have isdefaultcurrency='1'?
yes , that is correct . I used Oracle DataBase .
DECODE(isdefaultcurrency, 1, 1, null) please explain about it.
isdefaultcurrency attribute has boolean Type with 0 or 1 values.
I would like to show an error if check box was checked for the second time. The idea is that just
one check box should be checked.
thanks for your answer

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