Creation and modification of IFileItems

Dear Jazz participant,

I'm doing research with the Jazz repository and i want to look at creation and modification dates of files (IFileItem). The project data i have is from 06-2006 to 06-2008, but when i look at the creation/modification dates of files the earliest date i find is 06-01-2007. I get the dates by fetching for each file all changeSets where the file was involved in. How is it that i can't find any files created/modified before 06-01-2007?

Thanks,
Theo van Oostrum