[Koha-devel] barcodes issue

Hi, I have a problem with my Koha system I have some books in my system and I have assigned a barcode to each book in opac I have the barcode for each book but the issue is when I want to check out one of the books it gives me this barcode does not available in the database and when I go to the database there is no barcodes. So how can I fix this? any help!