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runtime.getCurrentUser().<https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4296668859.html|getPreference(options)> doesn't seem to be able to return any of the <https://system.netsuite.com/app/help/helpcenter.nl?fid=chapter_N3251359.html#:~:text=On%20the%20Restrict%20View%20tab|user preferences on the 'Restrict View' tab> (they all return `null` no matter the selection).
I can successfully get the values of other preferences (such as `colortheme`)
Has anyone else encountered this or know of a workaround?

You might have the same issue but it's worth trying N/config module

what a treat to wake up and find this. Cheers Michoel!

Admin_Restriction_Preference_Alert_js

Here's the script btw. This is for alerting user when they have a restriction set in their preferences. I've only enabled this for UI context and Admin role.

Injects JS to the page using an inline html field (unsupported) during `beforeLoad`.
Then uses the (undoc'd/unsupported) `showAlertBox()` and `hideAlertBox()` functions to show a warning banner.

You can use Form.addPageInitMessage to add a message on before load

Also if you are injecting client script you can `require` N/ui/message

Admin_Restriction_Preference_Alert__using_Form_addPageInitMessage___js.js

FWIW, here it is using `Form.addPageInitMessage()`
The only difference is you don't get the benefit of re-showing the message if the user opens the record in a new tab and doesn't navigate to it within the message's duration