I just found this post on the forum (I searched before already 😉 ):
http://support.advancedcustomfields.com/forums/topic/displaying-items-within-a-cpt-as-choices-in-repeater-for-another/
It might be related to my problem. Do I understand correctly my only solution is to maybe use the ‘Dynamically populate a select field’s choices’ solution? 🙁
