Workflow not triggered by custom function field update
I have a simple workflow that triggers when a field is updated on a Deal page. It works fine when I "manually" update the field via "edit" on that Deal page. It does NOT however work or trigger when that same field is updated with a custom function.
I need to workflow to trigger when the field is changed by a custom function also. Why is this not working? The field content is correctly changed by the function, but the system isn't recognizing that as a change relative to triggering the workflow for some reason.
Any help is super-appreciated.