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The international HL7 standard describes 2 modes of acknowledgement , 8.2.1 Acknowledgements: in chapter 2: "original mode and 8.2.2 Acknowledgements: " and "enhanced mode". For Australian purposes enhanced mode acknowledgement is required.

“The HL7 Standard makes no assumptions about the ownership of data. It also makes no requirements of its own on the subsequent action of the recipient of data, nor does it make any assumption about the design or architecture of the receiving application system. The scope of HL7 is restricted to the specification of messages between application systems, and the events triggering them. HL7 does not explicitly support, but can be used with, systems that support store and forward and data broadcast facilities (see the HL7 Implementation Support Guide).
The HL7 Standard makes no functional interpretation of the requirement that a system commit the data in a message to its database before acknowledging it. All that is required is that the receiving system accept responsibility for the data, providing the same integrity test that it would apply to data from any source.”[1]

Each message in a batch should be acknowledged individually. There is no requirement to ACK the batch as such.

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MSA segment details can be found here: https://confluence.hl7australia.com/display/OOADRM20181/2+Patient+Administration+for+Pathology#id-2PatientAdministrationforPathology-2.1.8MSA-messageacknowledgmentsegment

8.3 Accept vs Application Acknowledgements

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  1. Sender to Receiver with application ACK.

    1. REF Examples 1.7 Level 1.zip Level 1 Example 1 : https://confluence.hl7australia.com/display/OOADRM20181/Appendix+6+Example+Messagesin Appendix 6 Example Messages - 6.2 Patient Referral Examples.
      “MSH|^~\&|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID||JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|20170608223629+1000||REF^I12^REF_I12|MOE06082236987-957.1.4|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706-L1&&L|||AL|AL|AUS<cr>
      RF1…”
    2. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223642+1000||ACK|945375|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|CA|MOE06082236987-957.1.4
    3. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608224009+1000||RRI^I12^RRI _I12|AB19274|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706/RRI&&L|||NE|AL|AUS<cr>
      MSA|AA|MOE06082236987-957.1.4<cr>
      RF1|…<cr>
      PRD|…<cr>
      PID|…<cr>
  2. Sender to Intermediary with accept ACKs and later application ACK.

    1. REF Examples 1.7 Level 1.zip Level 1 Example 1: https://confluence.hl7australia.com/display/OOADRM20181/Appendix+6+Example+Messages1 in Appendix 6 Example Messages - 6.2 Patient Referral Examples.
      “MSH|^~\&|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID||JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|20170608223629+1000||REF^I12^REF_I12|MOE06082236987-957.1.4|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706-L1&&L|||AL|AL|AUS<cr>
      RF1…”
    2. MSH|^~\&|MiddleWare^MiddleWare V2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223849+1000||ACK|945376|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|CA|MOE06082236987-957.1.4
    3. MSH|^~\&|SecondHopSoftware^ SecondHopSoftware Build 5.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223701+1000||ACK|8ajojeaha2|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|CA|MOE06082236987-957.1.4
    4. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223629+1000||RRI^I12^RRI _I12|AB19275|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706/RRI&&L|||NE|AL|AUS<cr>
      MSA|AA|MOE06082236987-957.1.4<cr>
      RF1|…<cr>
      PRD|…<cr>
      PID|…<cr>
  3. Sender to Intermediary with multiple ACKs. Includes positive and negative user read ACK examples.

    1. REF Examples 1.7 Level 1.zip Level 1 Example 1: https://confluence.hl7australia.com/display/OOADRM20181/Appendix+6+Example+Messages1 in Appendix 6 Example Messages - 6.2 Patient Referral Examples.
      “MSH|^~\&|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID||JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|20170608223629+1000||REF^I12^REF_I12|MOE06082236987-957.1.4|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706-L1&&L|||AL|AL|AUS<cr>
      RF1…”
    2. MSH|^~\&|MiddleWare^MiddleWare V2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223849+1000||ACK|945376|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|CA|MOE06082236987-957.1.4
    3. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223852+1000||RRI^I12^ RRI _I12|AB19275|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706/RRI&&L|||NE|AL|AUS<cr>
      MSA|AA|MOE06082236987-957.1.4<cr>
      RF1|…<cr>
      PRD|…<cr>
      PID|…<cr>
    4. Positive read ACK:
      MSH|^~\&|DrJohnSmith^889119NF^AUSHICPR|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170609123701+1000||ACK|8ajojeaha2|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-READ-2020006&&L|||NE|AL|AUS<cr>
      MSA|AA|MOE06082236987-957.1.4

      Negative read ACK:
      MSH|^~\&|DrJohnSmith^889119NF^AUSHICPR|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170609123701+1000||ACK|8ajojeaha2|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-READ-2020006&&L|||NE|AL|AUS<cr>
      MSA|AR|MOE06082236987-957.1.4|Report is unreadable.
      ERR|^^^EUserError&Report is unreadable&L

  4. Sender to Intermediary with Error/Reject ack from application/intermediary.

    1. REF Examples 1.7 Level 1.zip Level 1 Example 1: https://confluence.hl7australia.com/display/OOADRM20181/Appendix+6+Example+Messages1 in Appendix 6 Example Messages - 6.2 Patient Referral Examples.
      “MSH|^~\&|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID||JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|20170608223629+1000||REF^I12^REF_I12|MOE06082236987-957.1.4|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-REF-SIMPLIFIED-201706-L1&&L|||AL|AL|AUS<cr>
      RF1…”
    2. MSH|^~\&|MiddleWare^MiddleWare V2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608223650+1000||ACK|945379|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|CA|MOE06082236987-957.1.4
    3. See point 1.
    4. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608224201+1000||ACK|8ajojeaha2|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|AE|MOE06082236987-957.1.4||||EHL7RelayAccessException^"Your user is not authorised to relay messages on this server. Access Denied"^L^EHL7RelayAccessException^^L
      ERR|^^^EHL7RelayAccessException&"Your user is not authorised is not authorised to relay messages on this server. Access Denied"
    5. MSH|^~\&|SomeSoftware^SomeSoftware V1.2^L|JD Medical^F144C1B5-56C7-43C1-80A4-83AD87D4FE5E^GUID|MERIDIAN^MERIDIAN:3.1.4 [win32-i386]^L|Buderim GE Centre Demo^0AE5C60C-A510-43B3-A509-C57F29B2D368^GUID|20170608224201+1000||ACK|8ajojeaha2|P|2.4^AUS&Australia&ISO3166_1^HL7AU-OO-ACK-201701&&L|||NE|AL|AUS<cr>
      MSA|AE|MOE06082236987-957.1.4||||EHL7RelayAccessException^"Your user is not authorised to relay messages on this server. Access Denied"^L^EHL7RelayAccessException^^L
      ERR|^^^EHL7RelayAccessException&Your user is not authorised is not authorised to relay messages on this server. Access Denied&L

8.4 User Read Acknowledgements
Anchor
8.4
8.4

User read acknowledgements serve the purpose of notifying the sender that a specific recipient has viewed the message and confirmed they have read the content. The user performing the read confirmation is therefore provided in the return acknowledgement. The Internal version ID component of MSH-12 is used to confirm an acknowledgement specifically is a user read. MSH-3 is the field is used for the purpose of reporting the read confirmation user details.

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Note: For the general acknowledgment (ACK) message, the value of MSH-9-2-Trigger event is equal to the value of MSH-9-2-Trigger event in the query message being acknowledged. The value of MSH-9-3-Message structure for the general acknowledgment message is always ACK.


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Anchor
footnote-1
footnote-1
[1]HL7 Messaging Standard Version 2.4, 2.3.2 Acknowledgments: original mode, 2000