Initial Filter with hardcoded value

I have setup some initial filters based upon https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_13.0/Architecture/Filters/index.html

The screen looks correct but...

When the drawer opens, we do not want the user to change the "Type" field. We want the "Type" to be fixed as "Vendor" then can only change or remove the filter for "Claim Mark"

Thoughts?