Changing the component polarity in the BOM does not change it in the Documentation Editor

There are two possible reasons for this. First, check the Tools > User Options > Documentation Session and make sure that the option Export BOM information has been checked:

Then, in the Documentation Editor, go to Tools > Options > Advanced, and check that the option Save component polarity during synchronization, has not been checked:

If checked, component polarity in the Documentation Editor is preserved during the synchronization with Process Preparation.