The words chātri etc. get acute accent (udātta) on the first syllable when followed by the word śālā,
Thus छा꣡त्रिशाला, ऐ꣡लिशाला, भा꣡ण्डिशाला ॥
Where the Tatpurusha compound ending in शाला becomes Neuter, by the option allowed in 2.4.25; there also in the case of these words, the acute falls on the first syllable of the first term; thus superseding 6.2.123 which specifically applies to Neuter Tatpurushas. Thus छा꣡त्रिशालम्, ऐ꣡लिशालम् ॥
1 छात्रि, 2 पेलि (ऐलि), 3 भाण्डि, 4 व्याडि, 5 आखण्डि, 6 आटि, 7 गामि (गौमि) ॥,