public override void PostExecute()
    {
        base.PostExecute();
        /*
          Add your code here for postprocessing or remove if not needed
          You can set read/write variables here, for example:
          Variables.MyIntVar = 100
        */
        Variables.receiptKey = newReceipt;
       
    }

    public override void Input0_ProcessInputRow(Input0Buffer Row)
    {
        /*
          Add your code here
        */
        //currentReceipt = Row.BelegKey;
        currentReceipt = Variables.receiptKey;
        newReceipt = Row.TransactionExtId;

        MessageBox.Show("The stored receipt key is: " + currentReceipt.ToString() + " The new is: " + newReceipt.ToString());
        if ( currentReceipt == newReceipt)
        {
            Counter++;
        }
        else {
            Counter = 0;
        }
        Row.Position = Counter;
        

    }