Update a Specific Purchase Order Header

{
  "PomstAcctDescription": null,
  "PomstActionCode": null,
  "PomstAddCode": null,
  "PomstAddCompCode": null,
  "PomstAddCompName": null,
  "PomstAddName": null,
  "PomstAdjCode": null,
  "PomstAdjPrice": null,
  "PomstBchNum": null,
  "PomstBilltoAddCode": null,
  "PomstBilltoAddName": null,
  "PomstBuyCode": "CMICUSER",
  "PomstBuyName": "CMICCUSER",
  "PomstChgCode": "O",
  "PomstCompCode": "001",
  "PomstCompName": "CMiC Construction Inc",
  "PomstComplianceFlag": "Y",
  "PomstContactCode": null,
  "PomstContactName": null,
  "PomstCostedCode": null,
  "PomstCurrCode": "CAD",
  "PomstCurrConvNum": 1,
  "PomstDefaultRecCode": "M",
  "PomstDeptCode": null,
  "PomstDesc1": null,
  "PomstDesc2": null,
  "PomstDistTypeCode": "M",
  "PomstExptdDate": "2022-12-21",
  "PomstFobCode": null,
  "PomstFobName": null,
  "PomstHoldPaymentDays": 0,
  "PomstHoldPaymentFlag": "N",
  "PomstImageFilename": null,
  "PomstInvCode": null,
  "PomstInvDate": null,
  "PomstInvDiscAmt": null,
  "PomstInvDiscDate": null,
  "PomstInvDueDate": null,
  "PomstInvSerCode": null,
  "PomstInvTypeCode": null,
  "PomstJobCode": null,
  "PomstJobCompCode": "001",
  "PomstManPoRecFlag": null,
  "PomstNum": "16.00099",
  "PomstOrdDate": "2022-12-21",
  "PomstOrigBidpAmt": null,
  "PomstPoAmount": 0,
  "PomstPorgrCode": null,
  "PomstPrintStatus": null,
  "PomstRecCode": null,
  "PomstRecDate": null,
  "PomstRefDate": null,
  "PomstRefNum": null,
  "PomstReleaseNum": 1,
  "PomstReprintDate": null,
  "PomstReqCode": "CMICUSER",
  "PomstReqName": "CMICCUSER",
  "PomstReqNum": null,
  "PomstReqReason": null,
  "PomstRoutCompCode": null,
  "PomstRoutJobCode": null,
  "PomstSelectFlag": "N",
  "PomstShipinstTxt1Code": null,
  "PomstShipinstTxt2Code": null,
  "PomstShipinstTxt3Code": null,
  "PomstShipinstTxt4Code": null,
  "PomstShipinstTxt5Code": null,
  "PomstShpinstDesc": null,
  "PomstShplneCode": null,
  "PomstShplneName": null,
  "PomstShpmetCode": null,
  "PomstShpmetName": null,
  "PomstStatCode": "R",
  "PomstStateDesc": "Approved",
  "PomstSuspDeptCode": null,
  "PomstSuspDeptName": null,
  "PomstTermCode": "NET30",
  "PomstTermDiscDay": 0,
  "PomstTermDiscPc": 0,
  "PomstTermDueDay": 30,
  "PomstTermName": "Net 30",
  "PomstTxt1Code": null,
  "PomstTxt2Code": null,
  "PomstTypeCode": "S",
  "PomstUnadjPrice": null,
  "PomstUserField1": null,
  "PomstUserField2": null,
  "PomstUserField3": null,
  "PomstVUuid": "F3B7677353477375E05316821FAC220C",
  "PomstVenCode": "1159",
  "PomstVenName": "Ace Supply Co. Inc.",
  "PomstVendOrderAddCode": null,
  "PomstWipAccCode": null,
  "PomstWipDeptCode": null,
  "PomstWkfPriorityCode": "1",
  "PomstIuCreateDate": "2023-02-02T12:23:56Z",
  "PomstIuUpdateDate": null,
  "PomstPostDate": null,
  "links": [
    {
      "rel": "self",
      "href": "http://mobtest.cmiccloudr12.com:80/cmictestrti/po-rest-api/rest/1/pomaster/F3B7677353477375E05316821FAC220C",
      "name": "pomaster",
      "kind": "item"
    },
    {
      "rel": "canonical",
      "href": "http://mobtest.cmiccloudr12.com:80/cmictestrti/po-rest-api/rest/1/pomaster/F3B7677353477375E05316821FAC220C",
      "name": "pomaster",
      "kind": "item"
    },
    {
      "rel": "child",
      "href": "http://mobtest.cmiccloudr12.com:80/cmictestrti/po-rest-api/rest/1/pomaster/F3B7677353477375E05316821FAC220C/child/PoDetailViewObj",
      "name": "PoDetailViewObj",
      "kind": "collection"
    }
  ]
}