HL7 Event : A17 : Bed Swap

  MSH           Message Header
  EVN           Event Type
  PID           Patient (1) Identification
   [PD1]        Additional Demographics (1)
  PV1           Patient (1) Visit
  [ PV2 ]       Patient (1) Visit - Additional Info.
  [ { DB1 } ]   Disability Information (1)
  [ { OBX } ]   Observation/Result (1)
  PID           Patient (2) Identification
   [PD1]        Additional Demographics (2)
  PV1           Patient (2) Visit
  [ PV2 ]       Patient (2) Visit - Additional Info.
  [ { OBX } ]   Observation/Result (2)