Hy,

I found great ressources on how to hide the edit button : http://help.openerp.com/question/14340/how-to-remove-save-button-from-form-view/ It works perfectly.

Yet I would like to generate the false value for specific groups. Here is my different tests.

Failed : edit="[('project.group_project_manager','in',[g.id for g in user.groups_id]))]"
Failed : edit="[(12,'in',[g.id for g in user.groups_id])]"
Failed : edit="[(%(project.group_project_manager)d,'in',[g.id for g in user.groups_id]))]"

First, is it possible and then is there any mistake in my code?

regards