Artikel 11

1. When the sentencing State has requested enforcement it may no longer itself begin the enforcement of a sanction which is the subject of that request. The sentencing State may, however, begin enforcement of a sanction involving deprivation of liberty when the sentenced person is already detained on the territory of that State at the moment of the presentation of the request.
2. The right of enforcement shall revert to the requesting State:
(a) if it withdraws its request before the requested State has informed it of an intention to take action on the request;
(b) if the requested State notifies a refusal to take action on the request;
(c) if the requested State expressly relinquishes its right of enforcement. Such relinquishment shall only be possible if both the States concerned agree or if enforcement is no longer possible in the requested State. In the latter case, a relinquishment demanded by the requesting State shall be compulsory.