Responsa for Bava Metzia 5:1
ואיכא למימר כולה למר ואיכא למימר כולה למר אמר סומכוס ממון המוטל בספק חולקין בלא שבועה הכא דליכא דררא דממונא דאיכא למימר דתרוייהו היא לא כ"ש
and where it could be maintained that the whole amount is due solely to that party Symmachus abides by the principle that 'Disputed money of doubtful ownership should be divided without an oath', how much more readily would he abide by that principle in a case where [as in our Mishnah] it can be said that the disputed object belongs to both [and that therefore it should be divided between them without an oath]? It can still be maintained that our Mishnah is in agreement with Symmachus. For the oath imposed upon disputants in our Mishnah is only rabbinical [not Biblical].<span class="x" onmousemove="('comment',' Cf. Shebu. 41a. ');"><sup>1</sup></span>
Teshuvot Maharam
A. A trustee appointed by both parties is not required to take an oath regarding the terms of his trusteeship. But, Leah was not appointed trustee by both parties. She was only appointed by the husband, and, therefore, is required to take an oath. Leah's husband cannot object to imposing an oath on her. If the law requires that a woman take an oath, the husband has no right to protest against her being degraded in court. But, since Leah, as long as she is married, has no money of her own, and were she to claim that she had already returned the deposit, no oath would be imposed on her, we now lend credence to her words and require no oath. However, the court should give A a writ stating that after Leah will be divorced or widowed she will have to return the money to A or take an oath to the effect that A deposited the money with her on condition that she return it upon his wife's consent only.
SOURCES: L. 306–7; Mord. B. K. 89. Cf. Pr. 739; Tesh. Maim. to Mishpatim, 44.