POWL query - deletion of views

Hello,

In Performance Management, There are some user views created. We need to delete those views.

• I have tried deleting from POWL_QUERY --> OSA_ESS_STATUS_OVERVIEW --> Layout varaint, but here the views are not displayed, nether delete option is enables.
• Tried deleting using PWOL_D01 and POWL_D08 but still in portall ESS the views exists. 

Is there some way i can delete this user defined views.

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Thanks,

Ashwini Jaokar