Calculation to display Incident category on Resolution window

Hi,

I wrote a calculation (after read) on the business object resolution from Incident.

I set this attribute on my resolution window cause I want to display the Incident category

on my resolution window (in WebDesk !) when I click on "Resolve"

My target is to see the Incident category when I open the resolution window.

But it will not work in WebAccess...

Any ideas?!

Thanks Marcello