Hi.
If I'm not wrong, it seems that only mailable object can have multiple update. In fact the objectButton.php creates Multiple Update Button under Mailable condition.
The same condition seems to apply to many other buttons.
It's true ? And why this ?
Thank you for your attention.
You're right.
We build the mailable lists to define which items could be mailable, avoiding to set up this feature for parameters screen.
When we set the Multi-update feature, we had to define same kind of list and before creating a multiupdatable list we realized that is would be exactly the same as mailable list, and there was no reason it coul differ. So we used same list (and then same condition)