If you looked from the outside on the qvw by reading their meta-data it should be possible. I remember that there is a flag IsLocked for each field is included. But from the inside only the macro-stuff will definitely work.
There could be another possibilty by reading the field-properties getselectedcount, getpossiblecount and/or getfieldselections into a variable, trigger an selection-action like "choose excluded values" or similar or try to select directly a value(-list) per fieldvalue() or concat() and compare then the current field-properties against the stored variable - but I'm not sure if you get a stable solution then you will probably need more then one action (clearing and storing from variable-values and the select-action) and actions won't be executed compelling sequentielly.
- Marcus
