WebApi保存收款单，报错

这个是我传入的JSON，请大神帮忙看下
{
"Creator": "ChengYuChao",
"NeedUpDateFields": [
""
],
"Model": {
"FID": 0,
"FBillTypeID": {
"FNumber": "SKDLX01_SYS"
},
"FPAYORGID": {
"FNumber": "103"
},
"FSALEORGID": {
"FNumber": "103"
},
"FSETTLEORGID": {
"FNumber": "103"
},
"FBillNo": "SKD2016070400001",
"FDATE": "\/Date(1467561600000+0800)\/",
"FEXCHANGETYPE": {
"FNumber": "HLTX01_SYS"
},
"FSETTLERATE": 1,
"FEXCHANGERATE": 1,
"FCURRENCYID": {
"FNumber": "PRE001"
},
"FPAYUNITTYPE": "BD_Customer",
"FPAYUNIT": {
"FNumber": "CUST0001"
},
"FCONTACTUNITTYPE": "BD_Customer",
"FCONTACTUNIT": {
"FNumber": "CUST0001"
},
"AR_RECEIVEBILL__FRECEIVEBILLENTRY": [
{
"FEntryID": 0,
"FPURPOSEID": {
"FNumber": "SFKYT01_SYS"
},
"FSETTLETYPEID": {
"FNumber": "JSFS01_SYS"
},
"FRECTOTALAMOUNTFOR": 2000.0,
"FREALRECAMOUNTFOR_D": 2000.0,
"FSETTLEDISTAMOUNTFOR": 0,
"FSETTLERECAMOUNTFOR": 2000.0,
"FHANDLINGCHARGEFOR": 0
}
]
}
}