P6.2 - Can Global Change criteria compare values of two fields?

I have a UDF ("WP") that I set equal to my Activity ID field awhile back.  Since then, some of my activity ID's have been changed.  I have now created a new UDF ("Old_AID") where I would like to store the values of the "WP" field, but only for the activities where "Activity ID" and "WP" are not equal (i.e. the activity ID changed at some point).

I did some searches and found something about storing values in a variable (&T1 and &T2?), but it seems to be for a different version of Primavera because the example screen shots don't look like anything I have (I think they are from the web based version).