Most organizations have a pre-existing official ID that is used organization wide that can’t be changed, but that could be very useful in matching the constituent in a Constituent Update Batch. Creating some way to specify that an imported field is used only for matching would go a long way toward making the Constituent Update Batch a more viable option for updating constituent information. Currently, on 2.94, we can’t commit a batch that contains our University-issued ID, but in some files we receive, we can’t match the constituent without it.