Is "i" a table reference?

let i:= select Transactions

is going to return an array of Id's for the Transactions table because Id is the default if you don't specfy another field like...

let i := (select Transactions).'Next One'

So, you have "i" which is an array. How do you determine which element in the array is being referenced? Once you determine that, if you want to use the array to represent the record in the table you would have to use a format like this...

item(i, N).'Next One' := DD

Keep in mind arrays are 0 based.

Lawrie, if you are just trying to access the current record use something like this...

let DD := this.'Next One';
        while DD <= today() do
            let DD := DD+28
        end
this.'Next One' := DD