Thanks all of you.
Jim was right. I forgot to put an id to the form. It solved the issue.
Now I have another question. I have some database POJO and I am going selecting an item from a list. I drop the first list and select an item. Remaining the item selected I drop another list and select the second item and so on. At the end, depending on every item I have selected, I draw a table with the data of the configured selection.
Every step is managed by a backing bean. How coud I get this backig bean?
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