Kernrechtsfrage
Whether the supervisory authorities could review the substantive validity of creditor A.'s claim.
Extrahierter Entscheid
No. Supervisory authorities, including the Federal Tribunal in this procedure, are not competent to examine issues of substantive law.
Extrahierte Begründung
The complaint attacked the underlying debt claim, but such material-law objections fall outside the scope of debt-enforcement supervision.