MuleSoft HL7 Connector Read Fails With Required Segment Missing

Mule application using the Health Level 7 (HL7) connector Read operation, fails to parse an incoming HL7 data with error "fatal message error: required segment missing".

Error from logs:

ERROR 2021-10-14 19:17:23,881 [[MuleRuntime].uber.02: [hl7-test-api].hl7-test-apiFlow.BLOCKING @4f71b7e3] [processor: ; event: 08b79ef1-2d5e-11ec-aebe-f01898971dd7] com.mulesoft.flatfile.schema.hl7.HL7SchemaParser: fatal message error: required segment missing: EVN at segment 1 (MSH) of message 00000006
ERROR 2021-10-14 19:17:23,882 [[MuleRuntime].uber.02: [hl7-test-api].hl7-test-apiFlow.BLOCKING @4f71b7e3] [processor: ; event: 08b79ef1-2d5e-11ec-aebe-f01898971dd7] com.mulesoft.flatfile.schema.hl7.HL7SchemaParser: fatal message error: required segment missing: PID at segment 1 (MSH) of message 00000006
ERROR 2021-10-14 19:17:23,882 [[MuleRuntime].uber.02: [hl7-test-api].hl7-test-apiFlow.BLOCKING @4f71b7e3] [processor: ; event: 08b79ef1-2d5e-11ec-aebe-f01898971dd7] com.mulesoft.flatfile.schema.hl7.HL7SchemaParser: fatal message error: required segment missing: MRG at segment 1 (MSH) of message 00000006

{Errors=[HL7Error(2,true,ErrorSegmentSequence,100,required segment missing)], Delimiters=|^~\&, MSH={MSH-05={HD-01=RSP1P8}, MSH-06={HD-01=MCM}, MSH-17=MR1, MSH-07={TS-01=199601051530}, MSH-08=SEC, MSH-19={CE-01=RODRIGUEZ, CE-02=JOHN}, MSH-09={CM_MSG-02=A49, CM_MSG-01=ADT}, MSH-10=00000006, MSH-11={PT-01=P}, MSH-12=2.3
EVN, MSH-13=49, MSH-03={HD-01=REGADT}, MSH-14=199601051530
PID, MSH-04={HD-01=MCM}}, ACK={MSH={MSH-05={HD-01=REGADT}, MSH-06={HD-01=MCM}, MSH-17=MR1, MSH-07={TS-01=199601051530}, MSH-08=SEC, MSH-19={CE-01=RODRIGUEZ, CE-02=JOHN}, MSH-09={CM_MSG-02=A49, MSG-03=ACK, CM_MSG-01=ACK}, MSH-10=00000006, MSH-11={PT-01=P}, MSH-12=2.3
EVN, MSH-13=49, MSH-03={HD-01=RSP1P8}, MSH-14=199601051530
PID, MSH-04={HD-01=MCM}}, ERR=[{ERR-01=[{ELD-04={CE-01=102, CE-02=Data type error, CE-03=HL70357}, ELD-01=MSH, ELD-02=0, ELD-03=13}]}, {ERR-01=[{ELD-04={CE-01=102, CE-02=Data type error, CE-03=HL70357}, ELD-01=MSH, ELD-02=0, ELD-03=13}]}, {ERR-01=[{ELD-04={CE-01=100, CE-02=Segment sequence error, CE-03=HL70357}, ELD-01=EVN, ELD-02=1}]}, {ERR-01=[{ELD-04={CE-01=100, CE-02=Segment sequence error, CE-03=HL70357}, ELD-01=PID, ELD-02=1}]}, {ERR-01=[{ELD-04={CE-01=100, CE-02=Segment sequence error, CE-03=HL70357}, ELD-01=MRG, ELD-02=1}]}], MSA={MSA-02=00000006, MSA-01=AR}}, Data={ADT_A49={MSH={MSH-05={HD-01=RSP1P8}, MSH-06={HD-01=MCM}, MSH-17=MR1, MSH-07={TS-01=199601051530}, MSH-08=SEC, MSH-19={CE-01=RODRIGUEZ, CE-02=JOHN}, MSH-09={CM_MSG-02=A49, CM_MSG-01=ADT}, MSH-10=00000006, MSH-11={PT-01=P}, MSH-12=2.3
EVN, MSH-13=49, MSH-03={HD-01=REGADT}, MSH-14=199601051530
PID, MSH-04={HD-01=MCM}}}}, Id=ADT_A49, Name=ADT_A49}