Contents of Preamble...EndPreamble in Layout not being output to tex file

[Geevarghese Philip]

Hi,

  I am trying to use the following layout file, which rgheck kindly 
provided me,  to typeset my document.

--------------------

#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass[report]{amsreport}

Format 4

Input stdclass.inc
Input amsdefs.inc
Input numreport.inc

Style Bibliography
        TopSep                4
        LabelString           "Bibliography"
        LabelFont
          Series              Bold
          Size                Huge
        EndFont
End

--------------------

The problem with this layout is that it prepends the number of the 
relevant subsection to the number of each theorem, definition, etc. I 
want to get sequential numbering for theorem etc., without the 
subsection numbers.

For this I changed "Input amsdefs.inc" to "Input amsmaths-seq.inc" (as 
suggested by rgheck), after which I got an error saying \theoremstyle is 
not defined. When I checked the tex file exported by LyX, I saw that 
indeed \theoremstyle is being used without any package that defines it 
being imported.

So I added the following lines after the Format line and before the 
Input lines:

---------------

Preamble
        \usepackage{amsthm}
        \theoremstyle{plain}
        \newtheorem{buha}{Buha}
EndPreamble

---------------

(I added the invocations to \theoremstyle and \newtheorem just for 
testing).

When I reconfigure, restart LyX and generate a tex file from my 
document, the tex file does not contain the contents of this preamble 
anywhere -- the Preamble...EndPreamble block is completely being ignored 
by LyX.

Please help me fix this : I want to have "\usepackage{amsthm}" included 
somewhere near the very beginning of the output tex file, so that it is 
present before the first invocation of \theoremstyle --- puting 
"\usepackage{amsthm}" in the document preamble doesn't help, so I guess 
it must be somewhere withing the layout file.

Thanks,
Philip