Problem: Wal-Mart receipts use a non standard barcode that is similar to 3 of 9. When you are using Code 39 detection, it will read the data on the receipt, but it will contain invalid data as well. This can also cause issues with batch / XML exports.
Solution: If using barcode engine 3 of 9, disable "Decode barcode into readable text" found on the Barcodes page of the Recognition module.
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