Which approach is better to define Data Annotation

问题:

Better approach to define Data annotation in entity or view model ?

I have entity and view model for the same entity and override the class with Data Annotation of entity framework. The question is i can add them without creating a separate model however i have concern about which one better approach?

Thank you in advance.

Entity

[Table("BatchInfo")]
    public partial class BatchInfo
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int BatchInfoId { get; set; }
        public string TRANCODE { get; set; }
        public string BatchId  { get; set; }
        public bool AMTFLAG { get; set; }
        public int POS { get; set; }

    }

View Model

 [NotMapped]
    public class BatchInfoViewModel:BatchInfo
    {
        [Required(ErrorMessage = "Transaction Code is required")]
        [Remote("CheckTranCode", "BatchInfo",AdditionalFields = "BatchInfoId", ErrorMessage = "Transaction Code Already Exists!")]
        [RegularExpression("[A-Za-z0-9^]*", ErrorMessage = "Invalid Transaction Code")]
        [StringLength(3, ErrorMessage = "Transaction Code Should Not be More than 3 Characters")]
        public new string TRANCODE { get; set; }
        [Required(ErrorMessage = "Batch Code is required")]
        [RegularExpression("[A-Za-z0-9^]*", ErrorMessage = "Invalid Batch Code")]
        [StringLength(5, ErrorMessage = "Transaction Code Should Not be More than 5 Characters")]
        public new  string BatchId { get; set; }
        [Required(ErrorMessage = "Position is required")]
        [RegularExpression("^[0-9]*$", ErrorMessage = "Only Number is allowed")]
        [Range(0, int.MaxValue, ErrorMessage = "Invalid Position")]
        public new  int? POS { get; set; }
}