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The issue was down to the version of PowerCLI installed on the scan server. An uninstall of Powercli 5.5 release 2 PowerCLI-5.5.0-1931983.exe (which is currently part of iQSonar scan perquisites documentatin) is required and reinstalled Powercli 5.5 release 1 PowerCLI-5.5.0-1295336.exe
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