refund / invoice / Too many reversed items on an invoice

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> Hi,
> 
> we tried to make an "refund" invoice. 
> 
> In detail we delivered some goods, and now some of them came back. In
> such a case we normally generate an invoice with negative quantity of
> the goods.
> 
> 
> In this case, every line has an negative quantity and value.
> And the invoice is printing fine.
> 
> But we can't book it. If we try we get an error:
>     Too many reversed items on an invoice
> 
> Any explantion? How can a refund fail if we get our products back?
> 
> -- 
> Florian Reitmeir
> 
> 
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We are experiencing the same issue with 1.2.13.  In our case though I 
believe I may have narrowed down the cause which may suggest that the 
system is working as designed, but we probably need feedback on how to 
properly handle such a scenario in the future.  In our case this is what I 
believe has happened:

1. We created a Vendor Invoice and purchased one product # 1001 (qty = 1 
after vendor invoice)
2. Customer purchases one product # 1001 via POS (qty = 0 after sale)
3. A different customer comes in an exchanges one product # 1001 that they 
purchased from another store (unbeknownst to us).  (qty = 1 after 
exchange)
4. Original customer from step # 2 above exchanges their one product # 
1001 that they purchased from us for another product (qty = 2 after 
exchange)

Since our original Vendor Invoice shows we purchased just one of these 
products, I believe that is causing the error 'Too many reversed items on 
an invoice'  when we attempt to complete step # 4 in LedgerSMB.

Obviously, we prefer not to allow exchanges of products not purchased from 
our store, but it is impossible to alleviate this scenario completely 
unless we force the customer to show a receipt in all cases for exchanges 
or returns.  In today's environment that is not really realistic in the 
case of exchanges, therefore, we need a way to handle the rare case where 
we have a customer come in to exchange a product, that was purchased 
elsewhere, but that we carry also.

Regards,
Steve