[web2py] SmartGrid and authentization required for view and edit actions ... why?

[David Marko]

I'm  testing SQLFORM.smartgrid() feature ... I can see the list of items but 
when clicking on view or edit links, I can just see flash message 'not 
authorized' . Why is this? How can I avoid this or even how to handle 
autorization correctly ... where to define it. I can imagine many different 
scenarios like user can view item but can't edit etc.