I have finished my college studies and am graduating with a Bachelor of Science degree. I have thought about what would be my next step and decided to pursue a Master's degree abroad, namely in Spain. I am submitting my application to multiple Universities, and in a few, I came across a request for some sort of "certificate" that the Bachelor of Science, here in the United States qualifies you for a Master's degree. I came across the following: "Justificación de que el título aportado faculta, en el país expedidor del mismo, para el acceso a enseñanzas universitarias de posgrado." in a free translation that would be: "Proof that the title held by you, allows in the country it was expedited on, for access to a University Master program" or in another university's wording.
Sounds simple enough right? Except for the fact that everyone I consulted in my university, ranging from advisors to college directors is unsure of where to get something like that, or even how that would look like.
Well, my question can be summarized into, is there some sort of institution in the United States (or Ohio, if this would be a state-level issue) that offers some sort of document saying "In the U.S., Bachelor's degrees work just fine for a Master's program admission"?