如何使用Id、SyncToken为QBO IPP.NET SDK V3更新客户

如何使用QBO IPP.NET SDK V3的Id、SyncToken更新客户？

出现错误（您和admin@gmail.com正在同时进行此项工作。ajoshi@varstreet.com在你之前完成，所以你的工作没有保存。）

请告诉我哪里出了问题。

                IdType CustID = new IdType();
                CustID.Value = "22";
                var NewqboCustomer = new Customer()
                {

                    Id = CustID,
                    SyncToken = "0",
                    // Display name as Customer Name
                    Name = "Name",
                    ShowAs = "Name", //Print on check 
                    //                                
                    //Contact Info 
                    Title = "",
                    GivenName = "Contact1",
                    MiddleName = "",
                    FamilyName = "Contact1",
                    //   
                    //Notes ="Notes ",

                    Notes = new Note[]
                            {
                                new Note()
                                {                                        
                                    Content ="Test Notes",
                                }
                            },
                    TypeOf = partyType.Organization,
                    Address = new PhysicalAddress[]
                            {
                                new PhysicalAddress()
                                    {
                                        Line1 = "bill Line 1",
                                        Line2 = "Bill Line 2",
                                        Line3 =  "Bill Line 3",
                                        Line4 =  "Bill Line 4",
                                        Line5 =  "Bill Line 5",
                                        City = " Bill City ",
                                        Country ="Bill Country",
                                        CountyCode ="Bill Counrty code",
                                        CountrySubDivisionCode = "NC",
                                        PostalCode = "55712",
                                        PostalCodeSuffix="Postal Code Suffix",
                                        Tag = new string[]{"Billing"}
                                    },
                                     new PhysicalAddress()
                                    {
                                        Line1 = "Ship Line 11",
                                        Line2 = "Ship Line 21",
                                        Line3 =  "Ship Line 3",
                                        Line4 =  "Ship Line 4",
                                        Line5 =  "Ship Line 5",
                                        City =    "Ship City ",
                                        Country ="Ship Country",
                                        CountyCode ="Ship Counrty code",
                                        CountrySubDivisionCode = "NC",
                                        PostalCode = "55712",
                                        PostalCodeSuffix="Shippf",
                                        Tag = new string[]{"Shipping"}
                                    }                                       

                            },
                    Phone = new TelephoneNumber[]
                            {
                                new TelephoneNumber()
                                {
                                    DeviceType = "Work",
                                    FreeFormNumber = "111-345-3456"
                                },
                                new TelephoneNumber()
                                {
                                    DeviceType = "Mobile",
                                    FreeFormNumber = "111-345-3457"
                                },
                                new TelephoneNumber()
                                {
                                    DeviceType = "Fax",
                                    FreeFormNumber = "111-345-3457"
                                }
                            },
                    WebSite = new WebSiteAddress[]
                            {
                                new WebSiteAddress()
                                {
                                    URI = "http://www.varstreet.com"
                                }
                            },
                    Email = new EmailAddress[]
                            {
                                new EmailAddress()
                                {
                                    Address = "india@varstreet.com"
                                }
                            },
                    SalesTermId = new IdType()
                    {
                        //idDomain = idDomainEnum.QBO, 
                        //Value = "8" 
                    },

                };
                var output = commonService.Update(NewqboCustomer);