Not able to delete device from OME

Hi,

I need to delete the server device in OME but it still appear in the device discovery inventory after delete. It also shown double entry in the discover inventory. I get know from this forum it need to delete device in ome database but it is not provide the step. Can you let me know which table name and  row I need to take care? below is my OME deatil.

 Server OS : Windows 2008R2, Database: MS SQL server 2008R2 (Install to local server).OME version: 1.2.1.0.

Double entry for device which cannot delete

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Thanks