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CB has 2 fields: UPC and ISBN (There is also an AltUPC but that can be ignored for now) For modern Books the UPC is the composed of a composite of ISBN-13 + a checksum + Price ISBN contains the ISBN-10 number. (You can try to put the ISBN-13 there but if you the entire value in UPC and TAB out of the field, it will automatically fill in the ISBN-10 number (as CB decodes it). For your scanner to work successfully, it must be able to pick up the last 5 digits (get the full UPC). If it doesn't it will pick up what is the ISBN-13 number that is not stored in CB. Unfortunately, I can't tell you how to set up your scanner. You will need to get a manual for it which should have the codes to set it up properly, if it is capable of doing so. Not all scanners can do this. Your other book software must store the ISBN-13 number which is why it works there. PS Alt UPC is used when some older books have two UPC number. For example, Book title 'Losers, The (Del Rey)' MMPB has 07099900599738520 on the back cover and 978034538520850599 on the inside of the front cover.