Add a custom button to Quotes record view

Hi,

I have a Sugarcrm 7.6 pro installation and I want to add a custom button to the Quotes record views and I found this guide in the documentation

https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.6/UI_Model/Views/Examples/Adding_Butt… 

that explain how to do this in a simple way. 

When I follow this guide for all the other modules (for example Accounts or Calls) I have no problems but for the module Quotes this procedure is not applicable.

The first step of the example says: "To add a button to the record view, you will first need to create the custom metadata for the view if it doesn't exist. You can easily do this by opening and saving your modules record layout in studio."

but when I do this, in the custom\modules\Quotes folder, only the \metadata folder is created and not the requested folder \clients\base\views\record with record.php file.

In the image you can see the folder hierarchy

How can I do the same thing in the Quotes module? Qhy this module is deifferent to the other?

Thanks for you help

Stefano