This issue is about customizing pdf export using the method described here, http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Configuration#HCustomizingthePDFexportLook26Feel , with a pdf template (which has an object of type XWiki.PDFClass in it).
- create a pdf template as described in the link above on wiki A. Can be the main wiki
- customize some of its properties, among which very importantly style and or xhtml2fo.xsl
- use this template on wiki A, it should work without problems
- go on a different subwiki, B, and try to use the same template. You'll notice that some of the properties will work but others, among which style and xhtml2fo.xsl, will not work .
I would expect this to work properly cross-wiki.