I would like to allow updates on a field only from the code of a managed package. This happens when the user clicks on Save on the VF page.
I do not want to allow the subscriber org to update this field through custom code.
I would like to restrict this in the trigger.
Any ideas on how this can be achieved? I do not want to use any new field to determine that I am making the updates from a VF page as the field in question itself is to serve that purpose.