Deactivate a record with a business rule

Hi all,

I have the following requirement: when the "Status reason" of a contact is changed to a certain value, I must deactivate the record. Now, I was hopeful to be able to do this with business rule, i.e.:

When "status reason" equals value "Some status"

Set "Status" to "Inactive"

Changing other fields seem to work well, but not for status. Is this a limitation of the business rules?

Thanks