Question juridique clé
Whether the judgment of 21 August 2006 was unclear, incomplete, contradictory, or otherwise in need of clarification regarding the set-off question.
Solution extraite
The dispositif was not shown to be unclear, contradictory, or in need of correction; the clarification request failed.
Motifs extraits
The prior judgment required the competent body to decide the still-unresolved admissibility of set-off; it did not set a deadline, and any timing question is governed by ordinary rules against excessive delay rather than clarification.