LyX ⇒ \includeonly not working

[gandi]

I don't seem to be able to get \includeonly{file1,file2,...} in the preamble of the main .lyx file to work (as described in the Embedded Objects manual, Section 6.2). Instead all included files are present in the output .dvi or .pdf file, no matter what I give in \includeonly{}. I have read that this feature was not supported in LyX 1.6.x. Can anyone confirm this?

Many thanks!