EF code first property not mapped - entity-framework

Question

The problem I'm encountering is when I try to insert a new record in a ASPxGridView which is a master of detail in an asp.net page.
This only occurs when adding a new record is required when there is no record.
EnderecoEscola entity:
namespace DAL
{
[Table("CAD_ENDERECO_ESCOLA")]
public class EnderecoEscola
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ENDESC_ID { get; set; }
[Required]
public int ESCOLA_ID { get; set; }
[Association("Escolas", "ESCOLA_ID", "ESCOLA_ID")]
[ForeignKey("ESCOLA_ID")]
public virtual Escola Escola { get; set; }
[Required]
public int TPOEND_ID { get; set; }
[ForeignKey("TPOEND_ID")]
public virtual TipoEndereco TipoEndereco { get; set; }
[Required]
public int ENDESC_UF_ID { get; set; }
[ForeignKey("ENDESC_UF_ID")]
public virtual UnidadeFederativa UnidadeFederativa { get; set; }
[Required]
public int ENDESC_MUN_iD { get; set; }
[ForeignKey("ENDESC_MUN_iD")]
public virtual Municipio Municipio { get; set; }
[StringLength(10), Required]
[MinLength(8)]
public string ENDESC_CEP { get; set; }
[StringLength(100), Required]
[MinLength(10)]
public string ENDESC_ENDERECO { get; set; }
[StringLength(15)]
public string ENDESC_NRO { get; set; }
[StringLength(25)]
public string ENDESC_COMPL { get; set; }
[StringLength(70)]
public string ENDESC_BAIRRO { get; set; }
[NotMapped]
public String TPEND_DESCRICAO { get; set; }
[NotMapped]
public String UF_SIGLA { get; set; }
[NotMapped]
public String MUN_DESCRICAO { get; set; }
}
}
DAL :
namespace DAL.utilities
{
public class OperationCadEnderecoEscola
{
public IQueryable<EnderecoEscola> GetId(int idEsc)
{
using (SecurityCtx ctx = new SecurityCtx())
{
ctx.Configuration.LazyLoadingEnabled = false;
var query = ctx.EnderecoEscola.Include("TipoEndereco").Include("UnidadeFederativa").Include("Municipio").Where(w => w.ESCOLA_ID == idEsc).OrderBy(p => p.ENDESC_ENDERECO).ToList().
Select(w => new EnderecoEscola
{
ENDESC_ID = w.ENDESC_ID,
ESCOLA_ID = w.ESCOLA_ID,
TPOEND_ID = w.TPOEND_ID,
ENDESC_UF_ID = w.ENDESC_UF_ID,
ENDESC_MUN_iD = w.ENDESC_MUN_iD,
ENDESC_CEP = w.ENDESC_CEP,
ENDESC_ENDERECO = w.ENDESC_ENDERECO,
ENDESC_NRO = w.ENDESC_NRO,
ENDESC_COMPL = w.ENDESC_COMPL,
ENDESC_BAIRRO = w.ENDESC_BAIRRO,
TPEND_DESCRICAO = w.TipoEndereco.TPEND_DESCRICAO != null ? w.TipoEndereco.TPEND_DESCRICAO : w.TPEND_DESCRICAO,
UF_SIGLA = w.UnidadeFederativa.UF_SIGLA != null ? w.UnidadeFederativa.UF_SIGLA : w.UF_SIGLA,
MUN_DESCRICAO = w.Municipio.MUN_DESCRICAO != null ? w.Municipio.MUN_DESCRICAO : w.MUN_DESCRICAO
}).Distinct().AsQueryable();
return query;
}
}
}
}
When applying for inclusion in ASPxGridView a new record and the method in DAL public IQueryable <EnderecoEscola> getId (int idEsc) is invoked to retrieve the data and they do not exists it is adding a new record on the master and detail occurs error
A field or property with name 'TPEND_DESCRICAO' was not found in the
selected data source.
Someone could guide me on how to solve the problem.
Tks.