I nothing change in Order via DI. Field cannot be updated (ODBC -1029).

Hi Experts!

After update SAP to 9.3(9.30.240) PL:14. broken closising some SaleOrder via DI-API.

We get next error:

[RDR1.DiscPrcnt][line: 1] , 'Field cannot be updated (ODBC -1029)

But the same document can be successfully closed through UI-SAP.

If I am trying to update documents through DI without Close( changing nothing in Order) and I get this error too.

Exemle code

 private static void CloseOrder(Company _company, int docKey)
        {
            SAPbobsCOM.Documents oldDoc = (SAPbobsCOM.Documents)_company.GetBusinessObject(SAP   bobsCOM.BoObjectTypes.oOrders);
            if (!oldDoc.GetByKey(docKey))
            {
                Console.WriteLine("Invalid SaleOrder Key.");
                return;
            }
            oldDoc.Update();
            int errCode;
            string errMsg;
            _company.GetLastError(out errCode, out errMsg);
            if (errCode != 0)
            {
                Console.WriteLine(errMsg);
            }
            else
            {
                Console.WriteLine("It is oreder not problem");
            }
        }

Why is this happening?

How can this be fixed?

Thank!