The FEEDER_AUDIT type used in the LOCATBALE class in the
ARCHETYPED cluster needs an attribute which can be freely
archetyped, which can contain various data from feeder systems. An
example from the Brisbane South HealthConnect Trial (BSHCT) in
Australia is to capture patient ids from HL7v2 messages so that if
information from a message is put into the wrong EHR, its source
system patient id can be used to diagnose and correct the error.