>I have table with order set in Data Environment.
>
>When I put CLOSE INDEXES on that table it closes structural index on that table.
>
>Why is that happening?
>In Help stands that it doesn't close indexes opened with table.
>
>I have checked with ORDER() function before and after CLOSE INDEXES.
>Before ORDER() it returns order but after CLOSE INDEXES it returns empty value.

What does it say if you try to SET ORDER TO again (right after the CLOSE INDEXES)?
Just thinking that the structural index may still be open but set to no order by te command.

good luck