Cannot select different values from a table in a view object

Hi everyone,
I have two tables, Employee : ID, NAME, SALARY, NO_ROLE and role : ROLE_ID, ROLE_EMP. I join them with NO_ROLE and ROLE_ID. I created a view object with these two tables in JDeveloper, I made a LOV with ROLE_EMP and I want to be ale to create an employee with his ID, NAME, SALARY and by choosing a value in the ROLE_EMP list. The problem is that when I choose a ROLE_EMP, I cannot commit because the link between ROLE_EMP and ROLE_ID is not made correctly in ADF.
In SQL, that's what I'm trying to do: INSERT INTO Employee VALUES (ID, NAME, SALARY, NO_ROLE) WHERE NO_ROLE = ROLE_ID of the ROLE_EMP I have selected.
Thanks for your help ;)
PS: I followed this tutorial to do this, but it is not exactly what I want to do: http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_55/jdtut_11r2_55_2.html

To be more generic, when I create an employee and select his role_emp (the name of the role) I want that the role_id of the role_emp to commit.

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Cannot select different values from a table in a view object

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