Can't remove one-to-one relationship

Hi, I accidentally added an one-to-one relationship between two entities (Travel Request and Hotel), and idHotel and idTranvelRequest were created respectively. A figure attached. To correct it, I am failing to remove the relationship through "Delete relationship" of the arrow "TravelRequest_Hotel", delete of idHotel, or deleted of idTravelRequest. The Module view does not work, either. It seems like a deadlock between two dependencies. How can I remove the relationship (and idHotel and idTravelRequest) ? Thank you, Hiro