CanceledIndicator possible values

In the AdministrationAgreement zib when looking at canceledIndicator it says that it is a Boolean. I would then expect there to be a “true” or “false” in the corresponding field. This was not the case, COMPLETED was found. This is one of many options which is recognized by the Hapi parser (MedicationDispense.class -> MedicationDispenseStatus). Now, there is ambiguity about the relation between the found values (for example COMPLETED) and the Boolean statements true and false. What values of MedicationDispenseStatus map to the ‘true’ and ‘false’ expected according to the zib wiki?

With kind regards,

Yuri