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First of we need the topology data, which can be checked here:
C:\ProgramData\SVA\BVQ\bvq-server\data\scanner-data\POWERVM\HMC\topology\done
or via the full support package. 
Now we need to look for the following file in the topology data: de.sva.bvq.powervm.model.VirtualIOServer.json

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1. We recommend converting the JSON into a pretty print format in the editor of your choice, as this is way more human readable, than the single line JSON provided by the HMC API call

2. Search for the following statement: "locationCode": null you will also find the volumeName close by

3. Scroll up in the JSON file until you find the name of the VIOS partitionName which the specific disk belongs to

4. Depending on how many findings you have regarding this statement (step 2) you need to repeat this step and the following one multiple times

5. Go to the VIOS system and execute the script provided by IBM (cleanup_cmdb_with_logging.sh) on the VIOS with the missing location code

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