Related for Ketubot 174:10
ת"ש פוחתת תפרע שלא בשבועה כיצד היתה כתובתה אלף זוז ואמר לה התקבלת כתובתיך והיא אומרת לא התקבלתי ואינה אלא מנה נפרעת שלא בשבועה
Come and hear: A woman who declares that her [original] ketubah was less [than the amount recorded in the document] receives payment without an oath. How [is this so]? If her ketubah was for a thousand zuz and when her husband said to her, “You have already received your ketubah,” she replies. “I have not received it, but [the original ketubah] was only for one maneh,” she receives payment without an oath.
Tosefta Ketubot
One who reduces her ketubah, she can collect [it] without an oath [that she hasn't already collected it]. How so? Her ketubah was 1000 zuz. He said to her: "You received your ketubah", and she says, "I didn't receive it but it was only 100 zuz"—she can collect without an oath. [She can't collect her ketubah from] mortgaged property [without an oath]—one doesn't even need to say this for after her husband's death, but even during her husbands life. [She can't collect her ketubah from] property of orphans—one doesn't need to say this for adults, but even from minors.
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