Commentary for Niddah 30:2

אבל יש לה וסת לימים אסורה לשמש קסבר וסתות דאורייתא

was learnt only of a woman who had no settled period that was determinable by days alone but one that was determinable by both days and leaps, so that since the period depends on some specific act it might well be presumed, that she did not leap and that, therefore, did not observe any discharge. Where, however, she has a settled period that was determinable by the days alone, she must have no intercourse, for he is of the opinion that the restrictions relating to settled periods are Pentateuchal. Rabbah b. Bar Hana ruled: Even if she has a settled period that was determined by the days alone, she is permitted intercourse, for he holds the opinion that [the restrictions relating to] settled periods are only Rabbinical.

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