I recently assessed with BMC Support that the "Remove domain suffix from data source name" property (see documentation here) applies to the DEFAULT lookup field, i.e. the lookup field loaded by ETL using single lookup. The idea is to extend the functionality to ETLs using multiple lookup (e.g. VMware ETLs). A first option would be to apply the same "remove domain suffix" logic to all lookup fields potentially containing FQDNs (e.g. HOSTNAME, PARENT_HOSTNAME...). A more advanced option would be to let the user explicitly specify which lookup fields to apply the logic to.