Editing positionInRoute field via API

Hi Team,

We have a requirement to update the positionInRoute of an activity using the API. However, our attempts using both the PATCH/Update and POST/BulkUpdate endpoints have been unsuccessful. Below are the payloads we used:

1. PATCH/Update — { "positionInRoute": 1}
2. POST/BulkUpdate - {    "updateParameters": {        "identifyActivityBy": "activityId",        "fallbackResourceId": "1-2684FBPR",        "ifInFinalStatusThen": "doNothing"    },    "activities": [{            "activityId":14471,            "positionInRoute": 1    }]}

Could you please confirm whether the positionInRoute field can be updated via the API, and if so, let us know if there are any corrections needed in our approach?

Thanks