Thanks guys ! Now, one question and two bugs:
How do I do to bulk clear "ids" ?
I can clear them one by one, but I havent found a way to do it in BULK !
Now, the BUGS: when editing metadata book after book, I haven't found the keys shortcuts for the underlined "P" and "N" for "Previous" and "Next" ! I must use the mouse ! Is it me or is it a bug in the software ?

J-P.