Account balances from previous years can be retrieved using the ?ucetniObdobi parameter appended to the given URL.
Please refer to the documentation:
In addition, it is also possible to retrieve account movements and the trial balance from previous periods — see the localhost examples below.
Account movements: https://localhost:5434/c/testovaci/pohyb-na-uctech/(datVyst < 2019-01-01).xml?detail=full
Trial balance: https://localhost:5434/c/testovaci/obratova-predvaha/(ucetniObdobi = 'code:2018').xml?detail=full
