It may be possible to use a slightly different approach. for example, if
you are putting the ID's into an evar, there is a metric created for
that evar called, "evar instance"... for example, if the evar is cust
ID, then there is a metric called cust ID Instance. you can create a
segment that simply has "custom id instance exists" and that will
capture all of the instances where there is a customer ID. Similarly, if
you have a Classification file, you can select those items that do not
have "uns...