On my bookshelf on EYB, I have marked any books that my parents also have with a bookmark, so that I can find recipes that I would be able to make whilst visiting. I am also slowing going through my books and marking recipes that I would like to make. However, when I then go to find recipes that I would like to make and have the recipe for at my parents house, by selecting both bookmarks in the filter menu I'm unable to do so - selecting one bookmark filter clears the other one. This severely limits the usefulness of bookmarking books that my parents own.