UNIQUE constraint on DAC column

I have a field in a custom DAC and I created a SQL constraint to ensure it is unique.

    [FromCustomerID] [int] NOT NULL UNIQUE,

Is there a way I can setup this DAC field to enforce this constraint so that it doesn’t require the DB to be hit prior to identifying the value entered in a grid is invalid?

This is my DAC field:

        #region FromCustomerID
        [Customer(IsKey = true)]
        [PXUIField(DisplayName = "From Customer")]
        [PXRestrictor(typeof(Where<BAccount.parentBAccountID, IsNull>), ICSMessages.ChildAccount)]
        public virtual int? FromCustomerID { get; set; }
        public abstract class fromCustomerID : PX.Data.BQL.BqlInt.Field<fromCustomerID> { }
        #endregion