Problem with custom field with TimeList type

Dear Team,

I have created a custom field with TimeList type. The purpose of this field is to enter Hour:Minute (HH:MM)

       #region UsrTimeIn
       [PXDBInt]
       [PXTimeList]
       [PXUIField(DisplayName = "Time in")]  
       public virtual int? UsrTimeIn { get; set; }
       public abstract class usrTimeIn : PX.Data.BQL.BqlInt.Field<usrTimeIn> { }
       #endregion

The result of Customization was being able to select HH:MM in the available TimeList.

But when entering HH:MM manually (for example: 10:25), it cannot be done.

Please help me the solution !

Best Regards,

NNT