The principle is that when a change copy is created, a copy of the contract is created in the system, on which the user makes the change. After checking the made change, the user transfers this copy of the contract to the original, at the same time a record of the change is stored in the system. If there is a change copy, the original contract is "blocked", i.e. it is not possible to charge it or make any changes. Only one change copy can be created for each contract. A change copy can only be changed by the user who is the owner of the change copy. If necessary, it is possible to change the owner of the change copy.
Creating a change copy is described below.