俱舍論記 6.213

6.213

「總論已竟至俱相應士用」者，此下第二對因配果。此中明果從因而生，故唯說四。離繫果常，非六因生，故此不說。

Regarding "The general discussion being completed ... simultaneous and associated [causes produce] the fruit of human effort": below this, second, matches causes with fruits. Here it explains that fruits arise from causes, hence only four are spoken of. The fruit of disjunction is permanent and is not produced by the six causes, hence it is not spoken of here.