We have instances when a customer request multiple quote updates on one job. Then when placing the order reverts to one of the previous quotes. Our quotes have hidden details like costs, margins & materials/colours etc. Whilst we have a copy of a basic PDF quotation, we do not have the hidden makeup of the details of that version of the quote. This is a different issues to the one referred to in Feature request "Save PDF docs generated for Sales and Purchases in Collaborate tab"