Detecting user status change in actions

Dears,

I've read the discussion in this topic:

Email on Status Change

and SAP Note 865619. I've implemented the solution in the same way it is described there. Unfortunately fm CRM_STATUS_READ_OW never has such results that below criteria are met:

  active = 'X'

  active_old = ' '.

There is always situation that both fields (active and active_old) are true. Hence, I'm not able to check whether user status has been changed. I want to send the email only when status changes.

Do you have any ideas how to resolve this issue?