It is a common thing to issue a warranty document, which similar to invoice, but without any price information, instead it contains goods and services (for example +1year warranty), their serial numbers and the warranty period. Please check the attached sample document.
It would be nice to extend the database (product data) with warranty period and include them on the invoice/order/offer.
Anyway, in the recent rules here and EU, if there is no warranty paper, the invoice could be used instead as warranty documents. The rules are flexible a little bit, but I think it is a common feature req. The invoice in this case must include the serial numbers (in general, not a bad practice to include them).
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