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JSF + PrimeFace: Validation Error: Value is not valid

 
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The idea is that: there are 3 drop down lists. IF I make selection in the first drop down, data dynamically generated in the second drop down. And if I make selection in the second drop down list, data dynamically generated in the third drop down. The below error happen when I make selection in the second drop down list. I use p:message to show the error message.

where "facility" is the id of the <h:selectOneMenu>. Do you have any idea what might cause this error
It might be a bit helpful if I give you a section of my managed bean



 
Thang Pham
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It is solved. Change RequestScoped to ViewScoped
 
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