אבן העזר י״חEven HaEzer 18

Se’if 1א׳

קִדּוּשִׁין תּוֹפְסִין בְּחַיָּבֵי לָאוִין וּבְחַיָּבֵי עֲשֵׂה, וְכָל שֶׁכֵּן בִּשְׁנִיּוֹת דְּרַבָּנָן (טוּר)

Betrothal takes hold between those who are prohibited by a negative commandment or positive commandment, and all the more so, [between those] with secondary Rabbinic prohibitions (Tur).