"Poseban postupak oporezivanja" is special for Croatian market
To use it, plese mark property for that kind of taxation in property settings
Once you generate Invoce or Advane invoice, MyRent will automatically generate TAX calculation.
You find it and track it in each invoice and you can simply change the value if you wold like it.
And to track list of such Invoices / document,
Plese use this link : https://app.my-rent.net/invoices/advance_calculation_special