Example:
1. A PO is created and gets fully invoiced in mid-December.
2. In January the fiscal period closure happens. Said PO does not get rolled over (as it's fully invoiced).
3. Sometime later in January the invoice gets paid.

The conflict lies in step 3: In Alma the payment is linked to the fund from the old year, while our financial department actually payed it from the fund of the new year.

One possible solution would be in step 2 to also allow rollover of PO lines that are fully invoiced but not paid yet.