俱舍論記 2.60

2.60

「如是已說至無執受餘二」者，此下第七有緣無緣門，第八執受、不執受門，結問頌答。於法界中一分有所緣，故言「半」也。

Regarding "Having explained thus... not appropriated, the remaining two": From here down, there is the seventh category of having an intentional object or lacking an intentional object, and the eighth category of appropriated and non-appropriated, presented as question and answer in verse. Within the dharma-dhātu, one portion possesses an intentional object, hence it says "half."