Customized Field is Read Only

Hi Team,

I added two customized fields to Branch table and created new tab in the company form (CS101500).

But those two fields are read only. Can someone please help me out to enable this field.

My Screen 

public sealed class BranchExt : PXCacheExtension<PX.Objects.GL.Branch>
    {
        public static bool IsActive()
        {
            return true;
        }

        #region UsrComUTRNo
        [PXDBString(20)]
        [PXUIField(DisplayName = "Company UTR No")]

        public  string UsrComUTRNo { get; set; }
        public abstract class usrComUTRNo : PX.Data.BQL.BqlString.Field<usrComUTRNo> { }
        #endregion

        #region UsrComAORefNo
        [PXDBString(20)]
        [PXUIField(DisplayName = "Company AO Ref No")]

        public  string UsrComAORefNo { get; set; }
        public abstract class usrComAORefNo : PX.Data.BQL.BqlString.Field<usrComAORefNo> { }
        #endregion
    }

Thanks

Bhagya