UFN_ADDRESSPROCESSINGOPTION_GETDEFAULT

            create function dbo.UFN_ADDRESSPROCESSINGOPTION_GETDEFAULT()
            returns uniqueidentifier 
            as
            begin
                declare @R uniqueidentifier = null;
                select top 1 @R = ID from dbo.ADDRESSPROCESSINGOPTION where ISDEFAULT = 1;

                return @R;
            end