We are of the opinion that the calculation order of the AZ account is incorrect.

The employee worked 17 hours of overtime in February. He started with an AZ account of 0.5h. --> At the end of February, he has +17.5h.

We subsequently changed the employee's AZ account (-9.5h) --> That would bring him to +8h. The contract covers 10 hours of overtime, meaning that the account should now be at 0. But apparently Projo deducts the full 10 hours and you end up at -2 hours.

In our opinion, Projo should calculate the AZ account including all changes and then subtract up to 10 hours from this sum. Apparently, the 10 hours are paid first and then the -9.5 hours are deducted from the remaining sum.