UIM no qos data displayed under dashboard designer

Document ID : KB000122154
Last Modified Date : 08/01/2019
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Issue:
After upgrading UIM from 8.51 to uim 9.0.2 existing dashboard which has qos data source not showing data chart now.
Although can confirm that there is data on SLM for same qos metric i.e qos_cpu_usage for total target. 
Environment:
UIM 8.51
UIM 9.02
Resolution:
As can see in SLM  snapshot there is duplicate data like 2 Total QOS  ,2 User QOS etc

dashboard_qos_missing

Error message on selecting Update on concerned qos data_source
Message Processing Error:Incorrect result size: expected 1, actual 2
SLM_data

After removing the duplicate QOS from SLM which does not have QOS data the dashboard qos data displays correctly