k3cloud 应付单通过webapi调用保存接口失败

请求参数如下：
[
"AP_Payable",
"{\"Creator\":\"\",\"NeedUpDateFields\":[],\"Model\":{\"FID\":0,\"FBillNo\":\"123456\",\"FBillTypeID\":{\"FNumber\":\"YFD02_SYS\"},\"FDATE\":\"2016\\/01\\/11\",\"FENDDATE_H\":\"2016\\/01\\/11\",\"FCURRENCYID\":{\"FNUMBER\":\"PRE001\"},\"FSUPPLIERID\":{\"FNUMBER\":\"1\"},\"FDocumentStatus\":\"A\",\"FPAYORGID\":{\"FNumber\":\"100\"},\"FSETTLEORGID\":{\"FNumber\":\"100\"},\"AP_Payable__FEntityDetail\":[{\"FCOSTID\":{\"FNumber\":\"FYXM02_SYS\"},\"FENTRYTAXRATE\":{\"FNumber\":\"SL04_SYS\"},\"FALLAMOUNTFOR_D\":\"10\",\"FOUTSTOCKID\":{\"FNumber\":\"123456\"},\"FCOSTDEPARTMENTID\":{\"FNumber\":\"BM000002\"},\"FINCLUDECOST\":0}]}}"
]
烦请相关专业人士看看，谢谢……