FIX. RadBarcode - the Checksum property of the EAN128 property should be set to true
The barcode cannot be read with the property set to false.
Workraound:
Telerik.WinControls.UI.Barcode.Symbology.EAN128 code39Extended1 = new Telerik.WinControls.UI.Barcode.Symbology.EAN128();
code39Extended1.Checksum = true;