I would share with our client problem, unfortunately this is not according with polish law. After upgarede (10.0.21) our client has a problem with the allocation terms. The allocation terms are parametrized on the main accounts. On production environment (in all legal entities) when client post the invoices on the vouchers are created additional line with allocation. This allocation has amount 0. This situation is not persistent, because in some cases this additional line is created and in the other not.