Hi,
I need to lock all the closed (Sales and Purchases) Invoices from being viewed or printed again for certain users
There is no workaround to do this in my opinion and knowledge
If there is any please let me know.
If not I like to add this topic to the ideas
You cannot do exactly what you ask about, restrict certain users from viewing only specific invoices. And you cannot restrict anyone from printing something they can view. Even if you could, they could still copy the screen image, so it would be pointless.