Commentary for Avodah Zarah 13:4
מחלוקת בבבא קמא וסתם בבבא מציעא דתנן כל המשנה ידו על התחתונה וכל החוזר בו ידו על התחתונה
The party which changes [an agreement] has the lesser right, and whoever retracts has the lesser right.
Daf Shevui to Avodah Zarah
The dispute between R. Judah and R. Meir was found in Bava Kamma. In Bava Metzia a mishnah teaches that whoever changes the agreement, such as a dyer who dyes the wrong color, has the lesser right. He can claim either the costs or the increased value, whichever is less. This is the same as R. Judah’s opinion.
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