成唯識論述記 5.533

5.533

述曰：有四無記，此何無記攝？是異熟生攝。從異熟識性恒時生故，名異熟生；非是從善、惡異熟業所生，名異熟生。異熟生無記名通故攝此。

The Commentary states: There are four kinds of indeterminate; under which indeterminate is this subsumed? It is subsumed under maturation-born (vipākaja). Because it is constantly born from the nature of the ripening consciousness, it is called maturation-born; it is not called maturation-born because it is born of good or bad ripening karma. The name maturation-born indeterminate is general, so it subsumes this.