Freedom API CustomerTransactionPost error

I am using Evolution 200 v 11.0.3.0 and configured the freedom Api sdk according to the Sage Evolution Freedom API Guidelines V2.01.  Everything seems fine except for the CustomerTransactionPost wich returns the error "Object reference not set to an instance of an object." Below is an example of my json: 

{
    "transac":
        {
            "Date":"/Date(2022-10-10T00:00:00)/",
            "CustomerCode":"Cash",
            "Reference":"AFC FEES DD",
            "TransactionCode":"DEP",
            "Amount":"230.55"
        }
}
Also on the CustomerFind API I AccountBalance is not displayed. 
Kindly advise how to resolve these problems. I sent an email to @support, however I need advise urgently. My sdk version file is 9.0.1.31.
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