成唯識論述記 6.102

6.102

述曰：即散亂心不專注者，便無定起。其第七識雖亦別緣，不專注心於境轉故，不深取故，故非定俱，如前第五卷說。故彼與此非是相違，此許易境，亦名定故，能深取故。

The Commentary states: That is, in a distracted mind that does not focus exclusively, no concentration arises. Although the seventh consciousness also cognizes distinct objects, because it operates on objects without focusing the mind exclusively and does not grasp deeply, it is not conjoined with concentration, as was explained previously in fascicle five. Therefore, that and this do not contradict each other, because here shifting objects is also called concentration, provided it can grasp deeply.