How to use DBSequence ?

Hello everybody ...
I'm using JDeveloper 11.1, JDK 1.6 , ADF Fusion web application.
I have two projects for that application, Model and View projects.
At Model I have entity object base on Oracle XE database table, there is sequences at that table and I use it to fill ID column for that table.
At Entity attribute I made these configureation for ID attribute:
Type: DBSequence
Updatable: While New
Sequence Name: my Database Sequence name
Start At: 1
Then, I used this entity to build VO, and I used the last in JSP page (I I rely on DBSequence to fill it)
At runtime when I try to commit new record I got this error :
ORA-01400: cannot insert NULL into ("MY_DATABASE"."MY_TABLE"."COLUMN_ID") ORA-06512: at line 1
Even I see nigative number generated for the ID.
that means DBSequence didn't fill the ID correctly, what should I do ?
Yours ...

Tiny,
According to the docs (Fusion Developer's Guide):
Note: The sequence name shown on the Sequence tab is used only at
design time when you use the Create Database Tables feature
described in Section 4.2.6, "How to Create Database Tables from Entity
Objects". The sequence indicated here will be created along with the
table on which the entity object is based.You need to either create a trigger in the database that will populate the ID via a sequence (see section 4.10.10 of that guide) or you can add a bit of code that will use the sequence name you populated to populate the ID (see section 4.11.5 of that guide).
John

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