http://hl7.org/fhir/StructureDefinition/messageheader-response-request|5.2.0

This extension enables the capability currently available through MSH-16 (Application Level acknowledgement) in HL7 Version 2 to declare at a message instance level whether a response is required or only upon error or success, or never.
NameFlagsCardTypeDescription & Constraints
Extension
0..1messageheader initiator requests a response
 
extension
?..0
 
url
?..?
 
value[x] *
1..? messageheader-response-request (required)
 
 
valueCode *
1..?code messageheader-response-request (required)