Resolve Prestashop won’t allow you to “Add a product” to an existing order

Last week, a customer report that the “Add a product” button disappear from the order editing page. This may cause by some external module installation.

To manually resolve the issue, you can

sudo vim /admin/themes/default/template/controllers/orders/helpers/view/view.tpl

find the following code

{if !$order->hasBeenDelivered()}

and update it to

{if (1)}

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