Thank you for bringing this to our attention. Indeed the Barcode item does not handle such case at the moment and we would consider addressing this for a subsequent version of the product. For the time being please use the following workaround:
sender, EventArgs e)
Telerik.Reporting.Processing.Barcode bcd = (Telerik.Reporting.Processing.Barcode)sender;
bcd.Value = ((Telerik.Reporting.Barcode)bcd.ItemDefinition).Value;
With the above code, the Value of the Barcode would be evaluated for each page and would give you the proper result.
All the best,
the Telerik team