Is it correct in a DTO class to have attributes of two or more tables?

I need to return in a REST data from two tables, to be consumed in an Android/IOS App, developed with xamarin. As I return a DTO, I thought it was good to bring in this DTO data from two tables, but I think this is somewhat gambi. The other solution would be to return two DTOs, there would be two services, one filling the release Listview and the other filling the item Listview. I don't know what the best approach would be. Below my DTO.

public class LiberacaoItensDTO
    {
        //Mapeamento dos campos, pois estava dando erro de cast e assim resolveu
        public LiberacaoItensDTO()
        {
            Mapper.Initialize(cfg =>
            {
                cfg.CreateMap<LiberacaoItensDTO, Liberacao>()
                .ForMember(d => d.DataLib, opt => opt.MapFrom(src => DataLib.ToString()));
            });
        }

        //Dados da tabela Liberação
        public int IdLiberacao { get; set; }
        [DefaultValue(0)]
        public int IdOrcamento { get; set; }
        [DefaultValue(0)]
        public int IdVendedor { get; set; }
        public string Vendedor { get; set; }
        public int IdFilial { get; set; }
        public string Filial { get; set; }
        [DefaultValue(0)]
        public float? DataLib { get; set; }
        public int IdCliente { get; set; }
        public string Cliente { get; set; }
        public string TipoVenda { get; set; }
        [DefaultValue(0)]
        public float Juros { get; set; }
        [DefaultValue(0)]
        public float Desconto { get; set; }
        [DefaultValue(0)]
        public double Vencimento { get; set; }
        [DefaultValue(0)]
        public double Acrescimo { get; set; }
        [DefaultValue(0)]
        public float Entrada { get; set; }

        //Dados da tabela de ItensLib
        public int IdProduto { get; set; }
        public string Produto { get; set; }
        [DefaultValue(0)]
        public float Qtde { get; set; }
        [DefaultValue(0)]
        public float Unitario { get; set; }
        [DefaultValue(0)]
        public float CustoDiario { get; set; }
        [DefaultValue(0)]
        public double UltCondicao { get; set; }
        [DefaultValue(0)]
        public float Total { get; set; }
    }

Method to bring the DTO in service

public List<LiberacaoDTO> getAutoriza(int idorcamento)
        {

            var lista = contexto.Liberacoes??????? Faria um Join com as duas tabelas, liberacao e itenslib
                        .Where(lib => lib.IdOrcamento == idorcamento)
                        .Select(lib => new LiberacaoItensDTO
                        {
                            //Aqui coloco os campos retornados
                        }).ToList();
            return lista;
        }