field update on field with no permission I have a field (selectbox) that is configured to not be shown (no 'view' permission) on a particular role, nor not to be edited (no 'edit' permission) by the same role. This role is only able to edit other fields. So normally, when this role edits the content, he should not see this particular field. But I want this field to automatically get updated via 'Triggered Rules'. I don't want anyone able to see this field in the first place. For example:

Price Range Field: 


Lowest to 1M
Between 1M to 5M
Between 5M to 10M
Greater than 10M


This is my set up so I could use this in exposed filter views to filter price ranges.

When that role enters some price in 'field_price', a trigger updates the price range field.

I do not have a problem with creating a new content, the price range gets filled out properly. However, when editing this content, I get this error 'Price Range: Illegal value'. When I make this field permissible for this role, this field gets updated properly.

I'm quite sure there is a way to this without doing any complicated stuffs.

Thanks in advance!
I would use a Computed Field for this purpose, then you can define in PHP how to populate it.
Or you can populate it with a hook_nodeapi submit.