成唯識論述記 3.528

3.528

述曰：三、論主答既非心王，故不自在，前第二卷於可熏中有自在義。世親《攝論》四外別立有自在義，方能受熏。

The Commentary states: Third, the author of the treatise answers: since they are not the cittarāja, they are not sovereign. In the previous second fascicle, among [the requirements for] that which can be perfumed, there is the meaning of having sovereignty. In the Mahāyānasaṃgraha, Vasubandhu separately establishes the meaning of possessing sovereignty apart from the four [conditions], and only then can it receive perfuming.