How create a vendor payment with cash flow ?

Dear experts,

I'm usign SBO 8.82 PL12

I want create a vendor payment with cash flow, I tried the next code (C#) but i cant get sucess (my payment was created with 0 value in cash flow field)

Note : the document and currency of payment is local, payed by automatic check.

myVendorPayment.PrimaryFormItems.SetCurrentLine(0);

myVendorPayment.AmountLC = 1000;

myVendorPayment.PrimaryFormItems.CashFlowLineItemID = 48; /* is a valid value */

myVendorPayment.PrimaryFormItems.CheckNumber = "1";

myVendorPayment.PrimaryFormItems.PaymentMeans = PaymentMeansTypeEnum.pmtChecks;

myVendorPayment.PrimaryFormItems.Add();

....Then add the payment

Also I tried without the 1rst and last line and I get no sucess.

Please help me.

Thank yo so much