Number Tables by Section in Document Settings doesn't work

[Daisuke Koya]

Hello All,

I am using LyX 1.6.10 for Macintosh.

My problem is that I would like my tables to be numbered as

        Table section.number

. Therefore, I've selected the Number Tables by Section Module under LyX: 
Document Settings, but it does not seem to have the same effect as inserting 
the following code in the LaTeX Preamble

        \numberwithin{table}{section}

. Could someone please tell me whether the above Module is working properly, or 
should I stick to inserting code in the LaTeX Preamble?

Thank you very much,

Daisuke Koya