UPV/EHU Regulations
In case you are a bachelor student at the University of the Basque Country (UPV/EHU), please be aware that the UPV/EHU’s Academic Regulations concerning the Bachelor Thesis indicates the mandatory existence of a co-supervisor member of the UPV/EHU when the project is directed by researchers from outside the UPV/EHU (article 4.4).
For more information (only in Spanish and Basque):