change-tracking compatibility of iWork with Office

I just got a warning when I opened a Word document that had tracked changes. Is there a list of exactly what kinds of changes are not being tracked between the two? A general list of all incompatibilities would also help. I'm using Pages 5.6.2 and Numbers 3.6.2.

I have worked with iWork (mostly Pages and Numbers) in the past few months and so far I'm OK with the features it provides and with Office compatibility. I'm hoping this will not be a reason to abandon it and go back to MS.

Thanks,

Dex

P. S. This is the warning I got when opening: