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Creates an ACK message with the minimum required information from an
inbound message. Optional fields can be filled in afterwards, before the
message is returned. Please note that MSH-10, the outbound message
control ID, is also set using the class
ca.uhn.hl7v2.util.MessageIDGenerator
. Also note that the ACK
messages returned is the same version as the version stated in the
inbound MSH if there is a generic ACK for that version, otherwise a
version 2.4 ACK is returned. MSA-1 is set to AA by default.