BackendFreak Thanks for your reply. If I don't find solution in the runtime I use your method.
@R0J0hound Thanks also. I don't found plugin which does this thing...
You can see here the steps :
1. I add my action 'set text' :
2. My code in the runtime:
So logically, the text of all instances of the object type which has the instance with the UID 'uid' will change.
3. I create project with the object text with three diferents instances with the UIDs : 0, 1, 2.
So logically again, text of all instances will be set to : "set text in all instances"
4. I get this error:
Thanks for you help. I don't request any code, just links or a way...