How to ignore Entity Mapping Id with Entity Framework?

I have the following class:

public class ParametrizacaoTolflux
{
    public int CodigoModulo { get; set; }
    public int CodigoSistema { get; set; }
    public string Descricao { get; set; }
    public int CodigoCategoria { get; set; }
}

I am performing the mapping according to the following class:

internal class ParametrizacaoTolflux_Mapping : EntityTypeConfiguration<ParametrizacaoTolflux>
{
    public ParametrizacaoTolflux_Mapping()
    {
        this.ToTable("MR_PARAMETRIZACAO_TOLFLUX");
        //this.HasKey(e => e...);

        this.Property(t => t.CodigoModulo).HasColumnName("CODIGO_MODULO");
        this.Property(t => t.CodigoSistema).HasColumnName("CODIGO_SISTEMA");
        this.Property(t => t.Descricao).HasColumnName("DESCRICAO");
        this.Property(t => t.CodigoCategoria).HasColumnName("CODIGO_CATEGORIA");
    }
}

If I do not define an Id in the mapping generates the following error:

  

"One or more validation errors were detected during model   generation: Amaggi.Tolflux.Dominio.DataAccess.ParametrizacaoTolflux:   : EntityType 'ParameterizationTolflux' has no key defined. Define the   key for this EntityType. \ r \ nPreparationTolfluxes: EntityType:   EntitySet 'ParameterizationTolfluxes' is based on type   'ParameterizationTolflux' that has no keys defined. \ R \ n "

If I set an id in the table, class and mapping works normal.

But I do not want to have an Id for this table, would I have to ignore this Mapping Id to not generate this error?

Or have another way to get around this?