webapi 收款单保存接口相关问题请教

收款单接口：明细下边的数据，相关参数该如何传递？

目前本人传的data是如下格式：

Array
(
[0] => AR_RECEIVEBILL
[1] => {"Creator":"","NeedUpDateFields":[],"Model":{"FID":0,"FBillTypeID":{"FNumber":"SKDLX01_SYS"},"FPAYUNITTYPE":"BD_Customer","FCONTACTUNITTYPE":"BD_Customer","FPAYUNIT":{"FNumber":"EB-49"},"FCONTACTUNIT":{"FNumber":"EB-49"},"FCURRENCYID":{"FNUMBER":"PRE001"},"FDocumentStatus":"A","FPAYORGID":{"FNumber":"100"},"FSETTLEORGID":{"FNumber":"100"},"FSALEORGID":{"FNumber":"100"},"FRECEIVEBILLENTRY":{"FSETTLETYPEID":"JSFS01_SYS","FRECTOTALAMOUNTFOR":"100","FHANDLINGCHARGEFOR":"1","FPURPOSEID":"SFKYT01_SYS"}}}
)

请高人指定，是哪里有问题，目前是失败的……