Canadian Tax form - alphanumeric BN Code field cant be edited
http://www.cra-arc.gc.ca/E/pbg/tf/t661/README.html
http://www.cra-arc.gc.ca/E/pbg/tf/t661/t661-fill-13e.pdf
http://www.cra-arc.gc.ca/E/pbg/tf/t661/README.html
http://www.cra-arc.gc.ca/E/pbg/tf/t661/t661-fill-13e.pdf
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