Hi,
To avoid any confusion between what we expect and what we really get in the reporting can you improve the "Run Test" functionality to reflect that all "0" values will be report as "[empty]" or "None" (Known issue: https://marketing.adobe.com/resources/help/kb/en_US/analytics/kb/zero-as-key-value-in-saint.html).
Here is what we get in the "Run Test":
But the report we get "None":
Here is teh answer I received from Adobe Client Care: "The screen shot that you are referring to is to validate the regular expression. When it come to Report & Analytics Classification, Classifications cannot differentiate the value 0 from a blank cell, so it cannot classify this value. This is working as designed."