Questione giuridica chiave
Whether the supervisory authority could be faulted for upholding the debt collector's authority to act under cantonal law and Art. 27 LP.
Decisione estratta
The challenge was inadmissible because it concerned the application of cantonal law, which cannot be reviewed in this debt-enforcement appeal.
Motivazione estratta
A violation of cantonal law may only be raised in public-law proceedings; this remains true even when federal law refers the matter to cantonal regulation or merely permits it, as with Art. 27 LP.