Part IV
Enforcement of criminal judgements
CHAPTER I
Enforcement of foreign criminal judgements
Article 101
Applicable law ; effects of enforcement
8. As soon as enforcement begins in Portugal, the requesting State must relinquish its right to enforce the same judgement ; the right of enforcement shall however revert to the latter State (a) where the sentenced person escapes and (b) where that State is informed that the sentence, if it involves the payment of a sum of money cannot be totally or partially enforced.
Escape
Ne bis in idem - foreign court
EDIT.