How can i sort list on a one2many field? This is the situation:

1.In class account_move some of it's field is:

    ...
    _columns = {  
         ...        
         'line_id' : fields.one2many('account_move_line','move_id','Account Move Line'),    
     } 

2.In class  account_move_line

    ...
    _columns = { 
        ...
        move_id : fields.many2one('account_move','Account Move'), 
        account_id : fields.many2one('account_account','Account'), 
    } 

My problem now is that from the view of account_move when i print its report the account_id is not sorted. So, does anyone who knows how to sort this account_id? By the way i am using Jasper Report.

Thanks for any help/suggestion.