Property not writable on type

<partial-response><error><error-name>class javax.faces.component.UpdateModelException</error-name><error-message><![CDATA[/file:/opt/application-server/webapps/gestor/WEB-INF/lib/core-jsf-0.0.10-20130930.162438-1.jar!/META-INF/resources/componentes/inputAutoComplete.xhtml @37,25 value="#{cc.attrs.targetValue}": /file:/opt/application-server/webapps/gestor/WEB-INF/lib/core-jsf-0.0.10-20130930.162438-1.jar!/META-INF/resources/componentes/inputMestreDetalheAtributos.xhtml @36,272 targetValue="#{cc.attrs.targetValue}": /view/perfil/formPerfil.xhtml @50,56 targetValue="#{perfilController.moduloSelecionado.modulo}": Property 'modulo' not writable on type br.com.sol7.olimpio.model.entity.basico.PerfilModulo]]></error-message></error></partial-response>

package br.com.sol7.olimpio.model.entity.basico;

import br.com.sol7.util.ObjectUtil;

import javax.persistence.*;
import java.io.Serializable;

@Table(name = "bas_perfil_modulo")
@Entity
@IdClass(PerfilModulo.class)
public class PerfilModulo implements Serializable, PerfilModuloModel {

    private static final long serialVersionUID = 1L;

    @Id
    @ManyToOne
    @JoinColumn(name = "id_perfil")
    private Perfil perfil;

    @Id
    @ManyToOne
    @JoinColumn(name = "id_modulo")
    private Modulo modulo;

    private Boolean novo;

    private Boolean editar;

    private Boolean remover;

    private Boolean relatorio;

    public Perfil getPerfil() {
        return perfil;
    }

    public void setPerfil(Perfil perfil) {
        this.perfil = perfil;
    }

    public Modulo getModulo() {
        return modulo;
    }

    public void setModulo(Modulo modulo) {
        this.modulo = modulo;
    }

    public Boolean getEditar() {
        return editar;
    }

    public void setEditar(Boolean editar) {
        this.editar = editar;
    }

    public Boolean getRemover() {
        return remover;
    }

    public void setRemover(Boolean remover) {
        this.remover = remover;
    }

    public Boolean getRelatorio() {
        return relatorio;
    }

    public void setRelatorio(Boolean relatorio) {
        this.relatorio = relatorio;
    }

    public Boolean getNovo() {
        return novo;
    }

    public void setNovo(Boolean novo) {
        this.novo = novo;
    }

    @Override
    public int hashCode() {
        int result = 17;
        result = 37 * result + (perfil == null ? 0 : perfil.hashCode()) + (modulo == null ? 0 : modulo.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {

        if (obj == null) {
            return false;
        }

        if (obj instanceof PerfilModulo) {
            PerfilModulo entity = (PerfilModulo) obj;
            return this.hashCode() == entity.hashCode();

        }

        return false;
    }

    public boolean isValid() {
        return (!ObjectUtil.nullOrEmpty(modulo) && !ObjectUtil.nullOrEmpty(modulo.getId()));
    }

}