The old Sharepoint 2013 management pack has a known bug in it, where it gives an error that a report can not be deployed. Something like the following:
Data Warehouse failed to deploy reports for a management pack to SQL Reporting Services Server.
Failed to deploy linked report ‘Microsoft.SharePoint.Server_Performance_Report’. Failed to convert management pack element reference
When you download the management pack from the catalog from within the SCOM console it seems to give you version 15.0.4420.1017 of the management pack, which still has this error in it.
To solve it go to the download page of the pack itself and get that version 15.0.4557.1000
Figured I write this down for those who might still bump into this, like I did again at a customer site.