vaadin data binding

Hi
What I want is to populate logic rule period table with an interface designe for that entity. In that interface I want to
combobox to get Logic periods which has a one-to-many relationship with Logic rule as defined in the entities. Also when I save that logic rule
data after selecting a logic period from the combobox I want the id of logic period to to be saved in the logic rule table as you can see in the screenshots of table data.
I also tried a converter for this but not quite sure about it. Your consideration to this problem ia really appreciated and would be helpful for someone else new to vaadin. Thanks!
17104783.zip (92.9 KB)