In content.ini, you'll need to set EnableClassGroupOverride to true:
[ContentOverrideSettings]
# Set this to true if you would like to do an override
# based on the class group of the content
EnableClassGroupOverride=false
You also need to use class group ID's instead of names. The following matches the Content class group:
Dear Kristof, thank you very much.
I have tried, but maybe I made an error in a step and it doesn't work. I made this:
1. I edited the file settings/siteacces/<i>mysiteaccess</i>/content.ini.append.php adding this:
4. I have deleted all the cache, but when I view a node containing an object create with the "groups_table" class the override system doesn't work and eZ publish use the standard template "design/standard/templates/node/view/full.tpl" instead the "full/table.tpl".