Worked this out below is the solution using PUT and below payload
API payload:
{
"Date": {
"value": "2025-08-13T07:00:27+00:00"
},
"NoteID": {
"value": "a474872e-1378-f011-ac49-0a202afc9b19"
},
"Owner": {
"value": "9239"
},
"RelatedEntityDescription": {
"value": "CUST000001, BA Industries"
},
"RelatedEntityNoteID": {
"value": "f19657f3-b24e-ea11-aa5c-bc0187cfc04c"
},
"RelatedEntityType": {
"value": "PX.Objects.AR.Customer"
},
"Status": {
"value": "Completed"
},
"Summary": {
"value": "TEST ID"
}
}
Response:
{
"id": "a474872e-1378-f011-ac49-0a202afc9b19",
"rowNumber": 1,
"note": null,
"Body": {},
"CreatedByID": {
"value": "amit.karyekar"
},
"CreatedDateTime": {
"value": "2025-08-13T07:00:39.330598+00:00"
},
"Date": {
"value": "2025-08-13T07:00:27+00:00"
},
"Internal": {
"value": false
},
"LastModifiedDateTime": {
"value": "2025-08-13T07:59:50.531777+00:00"
},
"NoteID": {
"value": "a474872e-1378-f011-ac49-0a202afc9b19"
},
"Owner": {
"value": "9239"
},
"RelatedEntityDescription": {
"value": "CUST000001, BA Industries"
},
"RelatedEntityNoteID": {
"value": "f19657f3-b24e-ea11-aa5c-bc0187cfc04c"
},
"RelatedEntityType": {
"value": "PX.Objects.AR.Customer"
},
"Status": {
"value": "Completed"
},
"Summary": {
"value": "TEST ID"
},
"Task": {},
"Type": {
"value": "N"
},
"Workgroup": {},
"custom": {},
"_links": {
"self": "/entity/Default/24.200.001/Activity/a474872e-1378-f011-ac49-0a202afc9b19",
"files:put": "/entity/Default/24.200.001/files/PX.Objects.EP.CRActivityMaint/Activities/a474872e-1378-f011-ac49-0a202afc9b19/{filename}"
}
}