Use the Articles tab to designate the reading order in a PDF
When creating an accessible PDF, InDesign should use the Articles Tab rather than the Layers Panel to structure the Reading Order. It reads properly but once you check the accessibility, the "Reading Order" panel shows a MESS. It's based on the Layers Panel which is madness to try and re-structure when creating a large form with hundreds of form fields. The Articles Panel is needed to set the tab order anyway. This would make the most sense to me.
Terry Veiga commented
Add my vote to this. I got stuck in The Matrix trying to use a convoluted mix of the Structure, Articles and Layers panels, and STILL had to settle for a McGyver-like fix in Acrobat. Spent loads of time for so little return and will wrestle with the same process all over again on the next project. :-(