Data modelling in OTBI?

Summary:

Hi

In Payables (and therefore also in the Procurement subject areas such as Procurement - Spend Real Time) it sometimes happens, that an invoice is matched with a purchase order, but afterwards it is not possible to match it anyway and then the invoice lines are rounded down to zero and a new line is created. That line is not connected to the PO, as you can see of my example:

Line 4 is created afterwards.

Is it possible to create some kind of formula that 'aggregates' the Purchase Order Number pr invoice and adds it to all invoice lines in OTBI? So that it would look something like this: