i think it's can be done by record representation format, either in table 
format or in requires validation format representation. (the 
table bursary_entries just save the id for that refered to bursary_users, 
but it will shown the barcode, if you set the format correctly either in 
table format or requires validation)

best regards,

- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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