rst2odt(1) uses a stylesheet file as a template for the ODT files it creates. The stock styles.odt file
shipped with it comes without page dimensions. When rst2odt is run and detects that there no paper size
is given in the stylesheet, it is automatically determined using paperconf(1).
When editing stylesheets with OpenOffice.org Writer (or similar programs), the resulting files always
carry a page size. rst2odt respects this setting and ensures that documents processed with custom
stylesheets look the same regardless of the host it is running on. If you want to get the original
behavior, i.e. a system-dependent paper size, you can run rst2odt_prepstyles over your custom stylesheet.
Remember to re-run the command whenever you change the file with a word processor.