Property 'punteggioMassimo' not found on type com.quadrante.medispa.model.Questionario

After I debugged the code and watched how the object Questionario is made I can see that there is no property punteggioMassimo, even if it is declared on the class.

//QuestionarioBase.java

public class QuestionarioBase extends com.xxx.cms.classgenerator.BaseBean implements Serializable {

//some other properties

protected Integer punteggioMassimo;

//some other getter and setter

public Integer getPunteggioMassimo() {
    return punteggioMassimo;
}

public void setPunteggioMassimo(Integer punteggioMassimo) {
    this.punteggioMassimo = punteggioMassimo;
}

This class is extended by Questionario.java which has nothing in it.

public class Questionario extends QuestionarioBase implements Serializable {

}

When the object is created in the controller it initializes all the properties besides punteggioMassimo. I also tried to force the initialization using the setPunteggioMassimo in the Expression tab of eclipse, but I had no luck with it!

Here is a picture of the Expression tab: