Create bill plan for a contract using rest api

Dear All,

Can anyone give me the ideal JSON body request to fill these fields using this endpoint: fscmRestApi/resources/11.13.18.05/contracts/300000078864625/child/BillPlan

Every time I try to fill out these fields, I am receiving this error:

The value of the attribute Bill Plan:Currency Conversion Rate Type Code must be null when the billing currency type isn't used. (PJB-2190622).

This is the body request that I use:

{

       "MajorVersion": 1,

       "BillMethodId": 12,

        "BillMethodName": "Amount Based Invoice",

        "BillPlanName": "Amount Based Invoice",

        "BillToContactName":"Accounting Department",

        "BillToAccountNumber":"112020",

        "BillingCurrencyType":"CONTRACT",

        "BillingCycle":"Immediate",

        "PaymentTerms":"60 Net",

        "BillSetNumber":1,

        "InvoiceHdrGrpOptName":"Associated project",

        "InvoiceCurrencyConversionRateType":"Corporate",

        "InvoiceCurrencyConversionDateType":"TRANSACTION",

        "LaborInvoiceFormat":"Labor Invoice Format",