A hearing system comprising a hearing device and at least two controllers connected to the hearing device for changing a state of the hearing device, wherein the hearing device is configured to maintain a transaction token having a present value associated with at least one present state parameter value of the hearing device. Each controller is configured to acquire, prior to changing the state of the hearing device, the present transaction token value and the present at least one state parameter value of the hearing device, to change the acquired parameter value, and to send back to the hearing device, as a state change request, the new at least one state parameter value together with the acquired transaction token value.