You are converting the UPC-E wrong. For EAN barcodes fill the barcode with leading 0 can be wrong. For UPC-E it is not.
Look at this project and find out how UPC-E is converted correctly: https://github.com/ankane/barkick
One more example:
- UPC-E: 07838604
- GTIN14: 0078000003864
You are converting the UPC-E wrong. For EAN barcodes fill the barcode with leading 0 can be wrong. For UPC-E it is not.
Look at this project and find out how UPC-E is converted correctly: https://github.com/ankane/barkick
One more example: