How to validate multiple rows in entity level?

Hi all..
I'm new in jdeveloper. I need your help.
I want to validate data in entity level. In business rules, for the entity validator, I use the unique key rule type.
So when I try to insert a data using the existing primary key, error message will be shown.
What can i do in entity validator, if the case like this :
In database : Id | Desc
1 | one
2 | two
then i want to insert 2 rows data:
Id |Desc
3 | three
3 | three
hope your help..
thanks..

did you set the Primay Key check box for this attribute?
<Attribute
    Name="Id"
    IsNotNull="true"
    PrimaryKey="true">
   ............................

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