Non-Fixed seat reporting

I'm hoping that one of the report writers with Tessitura can speak to this, but all input is welcome.

Virtually all of the reporting around package sales exclude non-fixed seat packages. Since our flex packages make up a significant portion of our subscription sales we are unable to use many of the stock reports.

What is it about non-fixed packages that precludes them from this reporting? For instance, in the Package Exchange Report I was able to include Non-Fixed packages by commenting out one line of the WHERE clause.  I didn't see anything in any of the reports I've looked at that touches on seat numbers or assignments so I am a bit baffled at the exclusions.

Something tells me I've asked this here before but I couldn't find it in my previous posts, so I apologize if this is a duplicate.