Acumatica PXSelector cannot get Current another field value in where clause

I have extension code like this

    #region StateID
    [PXDBString(50, IsKey = true, IsUnicode = true, InputMask = "")]
    [PXUIField(DisplayName = "State ID")]
    [PXDBDefault(typeof(State.stateID))]
    [PXParent(typeof(SelectFrom<State>.
        Where<State.stateID.
        IsEqual<District.stateID.FromCurrent>>))]
        public virtual string StateID { get; set; }
    public abstract class stateID : PX.Data.BQL.BqlString.Field<stateID> { }
    #endregion

and in other custom field, I want to select district from state but in district, I cannot filter it by state field. What am I missing ?

    #region UsrDistrict
    [PXDBString(50)]
    [PXUIField(DisplayName="District")]
    [PXSelector(typeof(Search<District.districtID,Where<District.stateID,Equal<Current<State.stateID>>>>),
            typeof(District.districtID),
            typeof(District.name),
            DescriptionField = typeof(District.name))]
        public virtual string UsrDistrict { get; set; }
    public abstract class usrDistrict : PX.Data.BQL.BqlString.Field<usrDistrict> { }
    #endregion