Release : 10.4.1
Component : Spectrum Report Manager
This issue is addressed in the 10.04.01.PTF_10.4.107 patch.
If specific landscapes need to be deleted in a DSS environment (not all) then please request 10.04.01.PTF_10.4.116 patch from Support.
It is also scheduled to be addressed in the Spectrum 10.4.1_BMP patch when released. No projected release date at the time of the publishing of this knowledge article.