Error message when changing the index entries in the task list of the Workflow Manager

Error message when changing the index entries in the task list of the Workflow Manager

Question:
Why is the following error displayed when a user wants to change the index entries of a document directly from the workflow task list?
"You don't have rights for the default result list for file cabinet with ID [GUID]."

Answer:
The Workflow Manager uses the standard search dialog. A specific result list is assigned to this search dialog in DocuWare Administration.
The user needs full access to the selected result list.