"contract Time.dateTill - Time.dateFrom" - поле має бути не обов'язковим

"message": {
        "description": "Required field",
        "contractTime.dateTill": "Required field",
        "title": "Required field",
        "contractNumber": "Required field",
        "dateSigned": "Required field",
        "contractTime.dateFrom": "Required field"
    }