Question juridique clé
Whether the IV office of Solothurn was competent to issue the revision decision after the insured moved cantons.
Solution extraite
The Solothurn IV office remained competent because the revision proceedings had been opened before the move and competence persists throughout the proceedings.
Motifs extraits
Under the applicable IVG/IVV rules, the office that is competent when revision proceedings are opened conducts them, and the once-established competence remains in force even if the insured later changes residence.