For the source text click/tap here: Bava Batra 132
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We learned in a mishna there (Pe’a 3:7): If a man writes a document granting his property to his sons, and he wrote a document granting any amount of land to his wife, she has lost her right to receive payment of her marriage contract. The Gemara questions this: Because he wrote a document granting her any amount of land, she has lost her right to receive payment of her marriage contract? Why should this be?
Many comments in the writings of the Rishonim and Acharonim indicate that while it is true that deference of amoraim for tannaim in deciding Halacha is a rule, Amoraim cannot disagree with Tannaitic sources in a direct manner, they can interpret those sources by proposing certain ukimtot, which allows them to disagree with the fundamental law appearing in the Tannaitic sources.
We review the literature on generational conflict and authority in rabbinic sources.