There is not a way to export the history to excel from within the view allocation screen, or elsewhere in the application itself.
One possible work around would be to use AOI to export Sales/Purchase Transactions to include the Allocation User, Date, Value and Reference fields. With this it might be possible to establish allocations - but only if there were no more than three for a transaction, as that is the limit of the fields available in the template.
Therefore, if you are looking for a report to deliver a specific result this would have to be written for you.
