I forgot to say: FMP Advanced 9.0v3 on Mac
Thank you for your post.
Our Development and Software Quality Assurance (Testing) departments are aware of this issue, but no additional information is available.
The only workaround I see is to use two different scripts. One for the restricted access (where you use matching fields), and the other for custom order. You will then need to update your scripts menu to make sure the correct login has access to the appropriate import script.