update in a display business rule

Hi,

I have a request from the business :
they want that if the service desk enter a comment, the record appears in the list with a specific color (that's easy)
But then, if someone from a specific group opens the record, this should put the record color to normal.
It means I have to update the record when the user opens it.

I tried to do that with a display business rule, but if I do a current.update() when the users open the form, he gets a blank screen.

I tried to use gs.setRedirect, but without result.

Have you any idea on how to update a record when someone opens the form? Without any action from him?

Thanks a lot

rgds

Xavier