UserConnection in D365fo

Its used when we need to commit our transaction wehen standared code doesn't Commit.
example :SalesQuotationEditLinesForm_Sales_Send > checkSales() , COC and try to write 
custom insert or update operation here while validation is failed our transactions doesn't commit

static void KlForRecordInserted(Args _args)
{
    UserConnection userConnection;
    CustTable custTable;
    ;
   
    ttsbegin;
   
    userConnection = new userConnection();
   
    custTable.clear();
    custTable.initValue();
    custTable.AccountNum = "000020";
    custTable.Name = "My Test Customer";
    custTable.setConnection(userConnection); // set userconnection
    custTable.insert();
   
    throw error("An error that causes a rollback");
    ttscommit;
}