webapi保存多个单据体

销售出库单上加了个单据体，调用webAPI保存时，多加的单据体中保存不上没有内容，其他正常没问题。代码如下：
{
"Creator": "王三",
"NeedUpDateFields": [
""
],
"Model": {
"FID": 0,
"FStockOrgId": {
"FNumber": "HBFW"
},
"FSaleOrgId": {
"FNumber": "HBFW"
},
"FBillTypeID": {
"FNumber": "XSCKD01_SYS"
},
"FSettleCurrID": {
"FNumber": "PRE001"
},
"FDate": "2016-11-12 00:00:00",
"FCustomerID": {
"FNumber": "004"
},
"F_PBPB_Text1": "000878",
"F_PBPB_Base3": {
"FNumber": "101"
},
"F_PBPB_Text3": "XXXXXXXX",
"F_PBPB_Text4": "XXXXXXXX",
"F_PBPB_Text5": "XXXXXXXX",
"F_PBPB_Base4": {
"FNumber": "01"
},
"F_PBPB_Base5": {
"FNumber": "01"
},
"F_PBPB_Base12": {
"FNumber": "004"
},
"F_PBPB_Base2": {
"FNumber": "001"
},
"F_PBPB_Combo": "XXX",
"FEntity": [
{
"FEntryID": 0,
"FMaterialId": {
"FNumber": "002"
},
"FUnitId": {
"FNumber": "Pcs"
},
"FRealQty": "30.0000000000",
"FBaseUnitQty": "30.0000000000",
"FPrice": "30.0000000000",
"FAmount": "900.0000000000",
"FStockID": {
"FNumber": "CK002"
}
}
],
"F_PBPB_Entity": [
{
"FEntryID": 0,
"F_PBPB_Base7": {
"FNumber": "001"
}
}
]
}
}