成唯識論述記 3.77

3.77

述曰：所、能和合，是相應義。若同一時、同一處所，所熏之體非即能熏，亦非全相離，在他身上識為能熏等。

The Commentary states: The harmony of the perfumed and perfumer is the meaning of saṃprayukta (concomitance). If they are at the same time and in the same locus, the entity of the perfumed is not identical with the perfumer, nor is it entirely separated from it, as when a consciousness in another person's body acts as the perfumer, and so on.