Reader and getTemplate

Hi.

I use this script to unhide a template before printing:

this.getTemplate("LIAISON").hidden = false;
this.print({bUI: false, bShrinkToFit: true, nStart: this.numPages-1});

It Works fine in Acrobat Pro but it fails in Reader.

Error message from the JavaScript Console is:

NotAllowedError: Security settings prevent access to this property or method.

Template.hidden:697:Field Bouton 56:Mouse Up

(tested in Reader DC (Mac & Windows), Reader XI (Windows) and Reader 9 (Mac))

But… the JavaScript API reference shows getTemplate as available for Reader, beginning with version 5, there is not any restrictions in the quickbar.

As shown here : Acrobat DC SDK Documentation

Enable menu items JavaScript execution privileges is ticked in Preferences : JavaScript.

Enable global object security policy is unticked in Preferences : JavaScript.

And the document is trusted in Preferences : Security : Enhanced.

So what can I do to unhide this template in Reader ?

Did I mess something?