I nailed it... and I am ashamed :  

>  for id_line in row.line_id: t=t+db.line[id_line][line_field_name]
>
and not 
  for id_line in row.line_id: t=t+db.line[line_field_name][id_line]

-- 
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- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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