Our customers aggregate inventory transactions and rounddiff+/- are taken place normally. But suddenly for period 2022-12 (year end) the transactions were not created.

The setup on site has 0 days.
We have a period where ROUNDDIFF do not take place, tough periods before and after they are created normally.

Aggregate inventory transactions have been run for period 2022-12 in 4.1.2023 (this created ROUNDDIFFS for period 2022-11). Period 2023-01 has been run on 3.2.2023, but NO ROUNDDIFF were created (and at this time 2022-12 accounting period was closed).

Then again once we now ran the 2023-02 period - ROUNDDIFF took place - but for period 2023-1.

Still 2022-12 we  have 0 qty in inventory with inventory value..

Question is what are the prerequisites for ROUNDDIFF? And why is the period 2022-12 having 0 qty with value?