I have two AI CMYK files with a vector object in each. Both, when trying to save to PDF do not show in Summary any warnings. When trying to copy/paste from one AI file to another and then save the destination to PDF I get this "spot colors and transparency" warning. And this makes the print go wrong.
I tried : Select->Edit Colors->Convert to CMYK - did not help
Where did those spots and transparency came from if were not present in the origin files AND how to combine the two and get rid of the warning
Two examples are attached :