> Invoices are not really the best example in this case. Rather than
> deleting invoices I would suggest that you mark them as cancelled. I
> would be surprised if your tax jurisdiction would be happy about an
> accounts system that allowed invoice deletion. Tax collectors are
> suspicious people, usually ready to believe that we are all trying to
> dodge something. (And they are usually right).
>

It was just an example of document with header and items (maybe not really
the best).
But I was asked to include this kind of function in my software, becase in
certain situations invoice can be deleted i.e just after posting it. Only
one selected user (from Financial Dept.) has rights to delete an invoice.
(Just to explain)

Marcin