MDM Item Details iView – “Record is protected” message

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Symptom
When trying to edit a record via MDM Portal Item Details iView you see a message that “Record is protected, record is checked out” and you can not edit it. Trying to edit the same record with the Data Manager is possible without the protected-error.
Other terms
Protected, check out, MDM, Portal, iView
Reason and Prerequisites
When [...]