Related for Bava Metzia 101:13
רבי יהודה אומר אין אונאה לתגר: משום שהוא תגר אין לו אונאה
and R. Eleazar said likewise, 'Well spoken!' But did we not learn, Just as the law of overreaching holds good in the case of a layman, so it holds good in the case of a merchant. Now, who is meant by 'a layman?' Surely a Private individual! — Said R. Hisda:<span class="x" onmousemove="('comment',' Other versions: R. Papa. ');"><sup>12</sup></span>
Tosefta Kiddushin
"[Be betrothed to me] with the understanding that if I die you will not bound to a levir"—she is betrothed but his stipulation is invalid, for he stipulated against what was written in the Torah, and anyone who stipulates against what is written in the Torah, his stipulation is invalid. "With the understanding that I will have no responsibility for you for clothing or sex"—she is betrothed but his stipulation is invalid. This is the pneumonic: Anyone who stipulates against what is written in the Torah regarding a monetary matter—his stipulation stands; with a non-monetary matter—his stipulation is invalid.
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