BibTeX, biblatex and biber ⇒ BibLaTeX: force "idem" for 1st citations

[monamipierrot]

Hello, I use a phylosophy.verbose stye, a new style for BibLaTeX versy similar (but better) to the verbose-trad ones.
I have a lot of 1st citations of the same author one after the other, and I want BibLaTeX to output:
Name, Title1, pubsityyear, and Idem, Title2, pubcityear.
Any ideas on how to force an idem for a given single citation?
Thanks
Piero

[SOLVED]

see http://www.guit.sssup.it/phpBB2/viewtop ... adbe#42019