I don't know how to answer your questions to my question other than to say I am trying to delete it from aperture library. When I try to trash or delete nothing was happening.
I did solve this problem on my own. I moved the picture (which was actually a pages document that clicked print as a pdf to aperture) to a new project all its own. Then I deleted the project. That did it.
It is good that you could solve it this way.
Only it should not be necessary, to move an image to a new project. If you could not delete the image from its previous project, then there may be a problem with the Aperture library. In that case I'd repair the permissions on the Aperture library and repair the database, see this Manual page: