Assign DBSequence to a property in Entity Object

I want to add a sequence to the user_id field in user_info table of my database. For which I have followed the below procedure.

• Create a db sequence named “userid”

Create sequence userid start with 10000000001

• Open the Entity Attribute, “user_id” in the Entity Object of the application
• Select Type as Integer and  click on Value type “Expression” radio button
• Enter the below expression in the value field

 (new oracle.jbo.server.SequenceImpl("USERID",adf.object.getDBTransaction())).getSequenceNumber()

Where “USERID” is the sequence name which is created already

• Click on Ok