json post on openbravo

I'm trying to insert new record in openbravo through advanced rest client, but I'm getting this error: Exception when updating BusinessPartner(null).

For POST, I'm using the following URL:

http://173.230.148.65/openbravo/org.openbravo.service.json.jsonrest/BusinessPartner

{
data : 
{
_identifier: "carsss",
_entityName: "BusinessPartner",
$ref: "BusinessPartner/6C8417D0C2FA4B8B858CBF51C742F65B",
id: "6C8417D0C2FA4B8B858CBF51C742F65B",
client: "D5B4A1DF0C194F65930BB8945A8B3082",
client$_identifier: "DemoClient",
organization: "DC280AA41A5E479AB663B1D4DB6158C0",
organization$_identifier: "Purchase",
active: true,
creationDate: "2013-12-06T07:24:04+00:00",
createdBy: "E1A6A414BED14417B7235CBFDF00977C",
createdBy$_identifier: "DemoClient",
updated: "2013-12-19T04:32:17+00:00",
updatedBy: "E1A6A414BED14417B7235CBFDF00977C",
updatedBy$_identifier: "DemoClient",
searchKey: "customer",
name: "carsss",
name2: "carsss",
description: "This is cars",
summaryLevel: false,
businessPartnerCategory: "0109E0660DD349D6B00D96BF0CEAE6E2",
businessPartnerCategory$_identifier: "Customer",
oneTimeTransaction: false,
potentialCustomer: false,
vendor: false,
customer: true,
employee: false,
isSalesRepresentative: false,
referenceNo: null,
dUNS: null,
uRL: null,
language: "en_US",
language$_identifier: "English (USA)",
taxID: null,
taxExempt: false,
invoiceSchedule: null,
valuation: null,
volumeOfSales: null,
noOfEmployees: null,
nAICSSIC: null,
dateOfFirstSale: null,
acquisitionCost: 0,
expectedLifetimeRevenue: 0,
lifetimeRevenueToDate: 0,
share: null,
formOfPayment: null,
creditLimit: 1000,
creditUsed: 0,
paymentTerms: "A182B5EC1898407FA386ED4775ED6DDA",
paymentTerms$_identifier: "Immediate",
priceList: "DA10C6659DBE408B9789A01AF3CA7015",
priceList$_identifier: "Sales Price List",
printDiscount: false,
orderDescription: null,
orderReference: null,
pOFormOfPayment: null,
purchasePricelist: null,
pOPaymentTerms: null,
numberOfCopies: null,
greeting: null,
invoiceTerms: "I",
deliveryTerms: null,
deliveryMethod: null,
salesRepresentative: null,
partnerParent: null,
creditStatus: "O",
forcedOrg: null,
pricesShownInOrder: true,
invoiceGrouping: "000000000000000",
maturityDate1: null,
maturityDate2: null,
maturityDate3: null,
operator: false,
uPCEAN: null,
salaryCategory: null,
invoicePrintformat: null,
consumptionDays: 1000,
bankAccount: null,
taxCategory: null,
pOMaturityDate1: null,
pOMaturityDate2: null,
pOMaturityDate3: null,
transactionalBankAccount: null,
sOBPTaxCategory: null,
fiscalcode: null,
isofiscalcode: null,
incotermsPO: null,
incotermsSO: null,
paymentMethod: "8A18E79688DD4A179F2FDC14FBECED55",
paymentMethod$_identifier: "Check",
pOPaymentMethod: null,
account: "91E5EB8BECBF49BAA3391942D6328640",
account$_identifier: "BOA",
pOFinancialAccount: null,
customerBlocking: true,
vendorBlocking: false,
paymentIn: false,
paymentOut: true,
salesInvoice: true,
purchaseInvoice: true,
salesOrder: true,
purchaseOrder: true,
goodsShipment: true,
goodsReceipt: false,
recordTime: 1393321917803
}
}