3 instead of one.

 There are several Schools and traditions of Kalpa Sutras; and are ascribed to various Rishis. Among the Kalpa Sutras, the Asvalayana, Sankhyana and the Sambhavya belong to the Rig-Veda. The Mashaka, Latyayana, Drahyayana, Gobhila and Khadirai belong to the Sama-Veda. The Katyayana and Paraskara belong to the Sukla Yajur-Veda. The Apastamba, Hiranyakeshi, Bodhayana, Bharadvaja, Manava, Vaikhanasa and the Kathaka belong to the Krishna Yajur-Veda. The Vaitana and the Kaushika belong to the Atharva-Veda.

 Sri Ramanuja, who reckons Bodhayana as being the foremost among his Purava-acharya-s (Past Masters of his tradition Viz. Bodhayana, Tanka, Dramida, Guhadeva, Kapardi and Baruchi) does not, anywhere, equate Bodhayana with Upavarsha.

(e) Another reason for not identifying Bodhayana with Upavarsha is the stand taken by their followers on the question of the unity or otherwise of the Mimamsa as a whole.

It is said; Bodhayana laid equal importance of Jnana and Karma Kandas; as   the two together constituted the doctrinal system (Shastraikatva).   He held the view that directly after completing the rituals one should take up the investigation into Brahman, which is the study of Vedanta. His position was coined by the later Vedanta Schools as jnana-karma-samucchaya-vada, the doctrine that synthesizes jnana and karma.  This was also the position taken by Sri Ramanuja in his Sri Bhashya.

Sri Sankara, on the other hand, did not accord much significance to rituals, naturally, tended to differ from Bodhayana.

Bodhayana’s position also meant that Purva and Uttara Mimamsa are two sections of the same text.

But, Sri Sankara’s basic position was that the Mimamsa Sutra which commences with the statement  Atato Dhrama jijnasa is quite separate from the Brahma Sutra commencing with Atato Brahmajijnasa.  Sri Sankara’s Shatra-aramba refers to the beginning of the Brahma sutra; and not to Mimamsa that covered both Purva and Uttara. Sri Sankara presents his commentary as a sort of Mimamsa by calling it as Vedanta-mimamsa. He does not use the terms Purva –Mimamsa or Uttara -Mimamsa. He did not seem to regard Brahma Sutra as a latter part of the same text.

Sri Sankara maintained that the two systems are addressed to different class of persons. Karma-kanda consist injunctions to act in order to achieve certain results. But, liberation is not a product or a thing to be achieved. Jnana-kanda is about Brahman that already exists; it pertains to the ultimate purpose which is true knowledge of Self, and it is addressed to one who is intent on liberation.   Each section of Veda is valid in its own sphere; but, the two sections cannot logically be bound together.

Sri Sankara generally followed the explanations provided by Upavarsha. And, these were not the same as the views attributed to Bodhayana.  Naturally, these led to doctrinal differences between Sri Ramanuja and Sri Sankara.

(e) .Thus, the Advaita School believes that Bodhayana is different from Upavarsha.  That is also quite possible because of the vast time difference between the two. While Upavarsha may belong to about the fourth century BCE, Bodhayana the Vrttikara may have lived in the fifth or the sixth century AD.

It, therefore, seems safe to assume that Upavarsha, Krtakoti and Bodhayana as being three different persons.