UPCE barcodes aren't recognized by scanners. Check digit is calculated incorrectly.  Use 137350 ... should result in 01373501 where '0' and '1' are the numbers on the ends of the barcode.  Many other barcode generating scripts will correctly output a UPCE barcode that scans with the correct check digit. Even when the correct code 01373501 is assigned to the radbarcode it re-assigns an incorrect check digit of '2' so the resulting code reads 01373502 and is not able to be read by the scanner