Kernrechtsfrage
Whether the 13th-month salary is part of the gross wage under the GAV for sickness insurance coverage replacing the employer's statutory sick-pay duty.
Extrahierter Entscheid
No. The collective agreement's 13th-month salary clause is conditional and, after more than two months of incapacity, is reduced by one-twelfth per full month of absence; therefore it is not included in the gross wage for the sickness insurance basis.
Extrahierte Begründung
The court treated the norm as a normative GAV provision and applied ordinary interpretation. The text of Art. 8.5 GAV clearly shows that the entitlement to the 13th-month salary depends on actual work performance and is progressively reduced during extended incapacity, so no earned salary component remains to be insured under Art. 12.2 GAV.