Doc:

All IDX index files (non-structural, or non-CDX based, indexes) must be closed during transactions.
Only structural indexes are supported within transactions.


This is a necessary restriction for shared tables, but for a exclusive cursor does not have reason.

My application uses remote backends only, and therefore all the tables are exclusive.
Someone could ask to me:
the struct cdx they are not enough to you?

It could also be, but the indices idx come builded in much little time,
and for to order grid columns they are optimal.

Fabio