UFN_VATTAXRATE_GETTAXRATE

            create function dbo.UFN_VATTAXRATE_GETTAXRATE(@ID uniqueidentifier)
            returns nvarchar(50)
            with execute as caller
            as begin
                declare @TAXRATE nvarchar(50)

                select
                    @TAXRATE = TAXRATE
                from
                    dbo.VATTAXRATE 
                where 
                    ID = @ID

                return @TAXRATE
            end