You want to delete tasks in Carerix but the button to delete te task is grey or you want to delete tasks by "Choose action - delete" and you see the notification that you don't have the rights to delete a task.

You get the message:
​*** The action is performed on X of Y files. For X files is the action not allowed, or you don't have enough rights. ***

This indicates that the user role of the user that is logged in doesn't have the proper rights to delete tasks. Check this using the following method:

Are the rights set correctly? Then there is probably an invoice line that is created based on the task. First delete this invoice line. Then the task can be deleted.