Верхние колонтитулы страницы подчиненного отчета, отсутствующие в основном отчете, SSRS

This is a pretty well-known limitation of SSRS since 2000.

More here: http://social.msdn.microsoft.com/Forums/en-US/sqlreportingservices/thread/ba15e779-1de5-4c84-9d14-5739417c0258

and here: http://www.windows-tech.info/15/ddb42d342ca4bda8.php

One solution we are investigating is rendering each report individually as pdfs and then using a custom .net class, outside of SSRS, to programatically combine the pdfs.