Questão jurídica principal
Whether the cantonal court violated the duty to investigate by deciding on an incomplete file.
Decisão extraída
Yes. Relevant medical and administrative records were missing, so the factual basis was insufficient for a valid review.
Fundamentação extraída
Under the investigative principle, the insurer and court had to establish the decisive facts fully and correctly. Because substantial files were absent, including material medical reports and other records, further fact-finding was required.