Edit Order in Backend

Edit Order in Backend

I thought you can Edit an existing Order in the Backend and the PDF's (invoice, etc) will be recreated.

Now I tested this on a Live-Server and on my Development-Server, with 2 diffrent results.

Live-Server:
mysql 5.5.5-10.1.34-MariaDB
PHP-Version 7.1.23
Webserver Apache
PHP-Interface fpm-fcgi

Here I can edit an existing Order and add Products. Everything looks right.
The PDF is created, but changed Order-Date will be ignored!

Development-Server:
mysql 5.5.5-10.1.22-MariaDB
PHP-Version 7.1.4
Webserver Microsoft-IIS/10.0
PHP-Interface cgi-fcgi

When editing an Order an I try to add a Product (modal-window) by clicking on the productname, nothing happens.
F12 didnt show any console javascript error.

You can't add any article.
Changed order-date will not be updated in PDF.
Changing any other informations (example address) can be done and will be in new created invoice PDF.

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Aw: Edit Order in Backend

1. Order from (date create order - not date change)
2.
url?
admin login?