validationErrors on put request for encounter

Situation
validationErrors on put request for encounter.

"validationErrors": {
        "user": {
            "Required::NON_EXISTENT_KEY": "user must be provided, but does not exist"
        },
        "group": {
            "Required::NON_EXISTENT_KEY": "group must be provided, but does not exist"
        }
    },

After providing user and group in request body as empty
response :

 "validationErrors": {
        "user": {
            "NotEmpty::EMPTY_VALUE": "Encounter Author must not be empty"
        },
        "group": {
            "NotEmpty::EMPTY_VALUE": "Encounter Provider Group must not be empty"
        }
    }

What are the values for user and group as they are not mentioned in swagger doc.
OpenEMR Version
I’m using OpenEMR version (6.1 & 7.0)

Browser:
I’m using: chrome

Operating System
I’m using: Docker