Incoming messages must satisfy additional requirements for systems that allow overlapping identifiers.
If an HL7 message is going to be processed by one of the following message actions, then it must include a value for the identifier's assigning authority:
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AutoFill Keyword Set
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Medical Records Chart
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Merge Into AutoFill Keyword Sets And Documents
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Patient Record Processor
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Scripted Merge Processor
Note:
Every template used by one of these message actions must be configured to support assigning authorities. For more information, see Configuring HL7 Message Templates for Overlapping Identifiers.