In eCommerce —> sales → campaigns
I clicked on flatten report
I got this
The DataTable cannot be manipulated: Metadata for report Referrers.getCampaigns could not be found. You can define the metadata in a hook, see example at: http://developer.piwik.org/api-reference/events#apigetreportmetadata
my problem is that I can not revert back to hierarchical reports
My piwik has many ecommerce sites i manage with a lot of data
How can I revert back to hierarchical?