求解：Web API 修改客户联系人不成功？

环境：K3 Cloud 6.0
代码这样写，但是更新不了客户的联系人信息的？
{
"Creator": "HG",
"NeedUpDateFields": [
"FTEL",
"FENTRYID",
"FCONTACT",
"FJob",
"FOFFICEPHONE",
"FMOBILEPHONE",
"FFAX1",
"FContactEmail",
"FBIZLOCATION",
"FISDEFAULT",
"FContactId"
],
"Model": {
"FCUSTID": 105772,
"FDescription": "测试用户333",
"FNUMBER": "00006",
"FTEL": "15922222222",
"BD_Customer__FT_BD_CUSTLOCATION": {
"FCUSTID": 105772,
"FENTRYID": "100001",
"FCONTACT": "小A", //原名：a1
"FJob": "",
"FOFFICEPHONE": "",
"FMOBILEPHONE": "15922222222",//原电话：15911111111
"FFAX1": "",
"FContactEmail": "",
"FBIZLOCATION": "",
"FISDEFAULT": "True",
"FContactId": "105773"
}
}
}