Batch Trailer (BTS) segment -- HL7v2 v2.5.1.
Defines the end of a batch within a file. 3 fields per HL7 v2.5.1 specification.
@type t() :: %HL7v2.Segment.BTS{ batch_comment: term(), batch_message_count: term(), batch_totals: term(), extra_fields: term() }