成唯識論述記 5.181

5.181

述曰：行相及境二俱別，故不可並生。無此事故，善心等可，然，彼非執亦不可例。人、法二執境是一故，或境是多行相是一，亦可得之。今二行相及二境界不可得也。於四解中，第四為上。

The Commentary states: Because both the ākāras and the objects are distinct, they cannot arise simultaneously. Since this state of affairs does not occur, wholesome minds and the like can indeed [have varied factors], but they are not grasps and cannot serve as a parallel. In the case of the two grasps of person and phenomena, because the object is one, or because the objects are many but the ākāra is one, they can also occur together. In the present case, the two ākāras and the two objects cannot be admitted together. Among the four explanations, the fourth is the best.