CE0250 - Object element must have a key defined if object handling is set to Search for an object

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Object element must have a key defined if object handling is set to 'Search for an object'. I have this error in the training course , so please provide the solution
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If I'm guessing correctly, you'll have an import mapping where for at least one entity you set “Find an object (by key)”. If that is true, you need to have at least one attribute marked as the key:

 

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