Issue Encountered When Calling getValueAt() on ORU_R01 HL7 Message to XML Conversion

I'm facing an issue while converting an ORU_R01 HL7 message to XML, specifically with the <pidgrpgrp> kind elements. When I use the getvalueat() method before conversion, the XML includes the <pidgrpgrp> and other <grp> elements, but when I don't use the getvalueat() method, the XML is generated without these <grp>elements.

I've attempted to debug the issue using zwrite on the HL7 message before and after calling getvalueat(). Before calling it, the content appears different, and after calling it, the content shows buildmap=1, etc.Please see the xml generated in 2 cases.

Has anyone encountered a similar issue or have any insights into why this might be happening? Any suggestions on how to resolve this would be greatly appreciated.

XML without GetvalueAt()

<ORU_R01>
<MSH></MSH>
<PID></PID>
<PV1><PV1.AssignedPatientLocation><PV1.AssignedPatientLocation.1><PV1.AssignedPatientLocation.1.1>10002</PV1.AssignedPatientLocation.1.1></PV1.AssignedPatientLocation.1><PV1.AssignedPatientLocation.4><PV1.AssignedPatientLocation.4.1>DGP</PV1.AssignedPatientLocation.4.1><PV1.AssignedPatientLocation.4.2>GP</PV1.AssignedPatientLocation.4.2></PV1.AssignedPatientLocation.4><PV1.AssignedPatientLocation.9><PV1.AssignedPatientLocation.9.1>Monifieth Health Centre</PV1.AssignedPatientLocation.9.1></PV1.AssignedPatientLocation.9></PV1.AssignedPatientLocation><PV1.ConsultingDoctor><PV1.ConsultingDoctor.1><PV1.ConsultingDoctor.1.1>STED1G</PV1.ConsultingDoctor.1.1></PV1.ConsultingDoctor.1><PV1.ConsultingDoctor.2><PV1.ConsultingDoctor.2.1>STEWART, D.P.</PV1.ConsultingDoctor.2.1></PV1.ConsultingDoctor.2></PV1.ConsultingDoctor><PV1.HospitalService><PV1.HospitalService.1><PV1.HospitalService.1.1>E12</PV1.HospitalService.1.1></PV1.HospitalService.1></PV1.HospitalService><PV1.PatientType><PV1.PatientType.1><PV1.PatientType.1.1>NHS</PV1.PatientType.1.1></PV1.PatientType.1></PV1.PatientType></PV1>
<ORC>..</ORC>
<OBR>..</OBR>
<OBX></OBX>
</ORU_R01>

XML with GetValueAt() called

<ORU_R01>
<MSH></MSH>

<PIDGrpgrp>

<PIDgrp>

<pid></pid>..

</pidgrp></pidgrpgrp>
...

</ORU_R01>