在用webapi通过http推送应收单数据时，总是报错，返回错误信息如下：
{"Result":{"ResponseStatus":{"ErrorCode":500,"IsSuccess":false,"Errors":[
{"FieldName":"无法将类型为“Kingdee.BOS.JSON.JSONObject”的对象强制转换为类型“System.Collections.Generic.List`1[System.Object]”。","Message":" 在 Kingdee.BOS.WebApi.FormService.BatchSaveService.SaveBills(String data)"}],"SuccessEntitys":[]}}}
推送的json数据为：
{"Creator":"Kingdee268","NeedUpDateFields":[], "Model":{"FBillTypeID":{"FNumber":"YSD01_SYS"},"FMatchMethodID":0,"F_ab_Text":"0","FOWNERID":{"FNumber":"0"},"FDATE":"2016-03-10","FCreditCheckResult":"0","FID":0,"F_ab_Base3":{"FNumber":"AAE"},"FBUSINESSTYPE":"海运","FSETTLEORGID":{"FNumber":"01"},"F_ab_Text7":"4291","F_ab_Text6":"AEQ15040032","FISRETAIL":false,"FSALESBUSTYPE":"","FALLAMOUNTFOR":5,"FACCOUNTSYSTEM":{"FNumber":"0"},"FEntityDetail":[{"FTaxPrice":121.4,"FNoTaxAmountFor_D":-121.4,"FMATERIALID":{"FNumber":"WL0110"}}],"FCUSTOMERID":{"FNumber":"AAE"},"FENDDATE_H":"2015-05-30","F_ab_Base6":{"FNumber":"016"},"FByVerify":0,"FBillNo":"WREC-1110","FCURRENCYID":{"FNumber":"PRE001"},"FSALEERID":{"FNumber":"011243"},"FDocumentStatus":"C","FSALEDEPTID":{"FNumber":"022"},"F_PAEZ_Text1":"WTD","FISINIT":0}}
其中涉及的基础资料都对过，是存在的。
求指导。之前做好的定死数据是可以推送的，实在找不到异常点
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