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As a temporary workaround, this lookup should be converted to a CSV file-based lookup:
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Create a new CSV lookup called master_inventory_lookup.csv in the Splunk App for Lookup File Editing. Ensure that it is blank.
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Return to the SAP PowerConnect for PowerConnect application.
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Go to Settings → Lookups → Lookup Definitions.
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Search for and open the master_inventory_lookup definition under the SAP PowerConnect for Splunk app.
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Change the definition Type to file-based.
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In the Lookup file, set the valueto master_inventory_lookup.csv.
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Save the lookup definition.
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In the PowerConnect app, go to Settings → Searches, reports, and alerts.
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Select All from the Owner dropdown.
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Search “Master Inventory Lookup” and find the “Master Inventory Lookup - Lookup Gen - Run Once Only” search.
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Run this search.
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After the search concludes please proceed to any of the dashboards within the PowerConnect Splunk app. The dropdowns will now work as designed.