Google: Invalid object type for field 'itemReviewed'

[Robert9]

Invalid object type for field 'itemReviewed'
Items with this issue are invalid. Invalid items are not eligible for Google Search's rich results

It seems Google doesnt want to add 330 resources, because "Invalid object type for field 'itemReviewed'
Any idea what to do here?
Google: Invalid object type for field 'itemReviewed'

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