Key legal question
Whether the insured became incapacitated during pension coverage in a way that triggered the pension fund's liability for later invalidity
Extracted holding
No pension entitlement was proven, because the evidence did not show a continuous work incapacity of at least 20% during the insured period and thereafter without substantial interruption.
Extracted reasoning
The court found recurrent but fluctuating back problems, with longer symptom-free intervals and meaningful activity during retraining. The contemporaneous medical reports did not establish a sustained qualifying incapacity after coverage ended.