Absence REST API Get call does not have PersonNumber

Summary

Able to fetch Absence but not seeing Person number in the Rest Response.

Content

I am running this request

https://zzzzzzz.fa.em3.oraclecloud.com:443/hcmRestApi/resources/11.13.18.05/absences?q=endDate > 2019-09-20

I am getting the records but not seeing person number of employer names, I can see personid, period of service id so definitely its a correct record but I am not sure why I cannot see the person number as its coming as null. Anything I am missing ?

 {
            "absenceCaseId": null,
            "absenceEntryBasicFlag": true,
            "absencePatternCd": "GENERIC",
            "absenceStatusCd": "SUBMITTED",
            "absenceTypeId": 300000001805094,
            "absenceTypeReasonId": null,
            "agreementId": null,
            "approvalStatusCd": "AWAITING",
            "authStatusUpdateDate": null,
            "bandDtlId": null,