Dear Printum, we still are aware of this issue and we regret not to have helped you, though we spent lot of time on trying.
All in all, we doubt to have said, the module would work with another module, that strictly interferes the functionality of OrderEdit and also with modified invoice templates. Everyone knows, modules interferetaions can lead to weird results, especially in the case where both module impact the same functionality. Of course, modified invoices cannot read the information directly from the order after the editing and its not our fault or a module bug. Also, the template order-detail.tpl that contains values like {$mega.quantity} or $product.productmega, so something very special, can run the risk not to be compatible with something else.
All in all, we of course will refund you the money since you can contact us on addons with the message where we said, OrderEdit would be compatible to another third party module like this one. In this case we also would ask you to remove the 1/5 note for a working module
In any case, I regret you cannot use OrderEdit on your prestashop project
regrads
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silbersaiten support