Ibm cloud 错误：应在输入JSON for API的计划中至少指定一个计划规则

我在Bluemix UI中创建了一个自动缩放，保存了它，然后使用

cf env

检索策略。政策是：

{
    "policyState": "ENABLED",
    "policyId": "",
    "instanceMinCount": 2,
    "instanceMaxCount": 5,
    "policyTriggers": [
        {
            "metricType": "Memory",
            "statWindow": 300,
            "breachDuration": 600,
            "lowerThreshold": 30,
            "upperThreshold": 80,
            "instanceStepCountDown": 1,
            "instanceStepCountUp": 1,
            "stepDownCoolDownSecs": 600,
            "stepUpCoolDownSecs": 600
        }
    ],
    "schedules": {
        "timezone": "(GMT +01:00) Africa/Algiers",
        "recurringSchedule": null,
        "specificDate": null
    }
}

然后，我尝试从IBM devops部署阶段应用策略：

curl https://ScalingAPI.ng.bluemix.net/v1/autoscaler/apps/xxxx/policy -X 'PUT' \
    -H 'Content-Type:application/json' \
    -H 'Accept:application/json' \
    -H 'Authorization:Bearer *****' \
    --data-binary @./autoscaling_policy.json \
    -s -o response.txt -w '%{http_code}\n'

答复如下：

{“错误”：“CWSCV6003E:输入JSON字符串格式错误：应在输入JSON for API:Create/Update Policy for App xxxxx的计划中至少指定一个计划规则。”}

解决方法是删除schedules元素：

{
    "policyState": "ENABLED",
    "policyId": "",
    "instanceMinCount": 2,
    "instanceMaxCount": 5,
    "policyTriggers": [
        {
            "metricType": "Memory",
            "statWindow": 300,
            "breachDuration": 600,
            "lowerThreshold": 30,
            "upperThreshold": 80,
            "instanceStepCountDown": 1,
            "instanceStepCountUp": 1,
            "stepDownCoolDownSecs": 600,
            "stepUpCoolDownSecs": 600
        }
    ]
}

问题：为什么用户界面不抱怨计划，并允许我导出API调用不喜欢的无效计划