Hi all, does anyone know if it is possible to add a custom column in this sublist? I would like to add a memo field for each invoice line, I tried to add it as "transaction line fields", but could not apply it to the customer payment record.

If you click the Customise box (to the right of Clear button), then the Memo field should be available for selection ?

Yes, It is available to select it, but it takes the memo from the invoice (as inline Text) and I want to add an editable field like Disc. Taken and Payment columns.