aggregateRating within Review object - schema.org

Question

We're trying to use the aggregateRating tag but we're getting this warning in the SDTT:
The aggregateRating property inside a Review object applies to the review itself, as a creative work. Did you mean to use reviewRating instead.
We want to aggregate the reviews from all users, not use reviewRating (we already use that one for our own reviews).
Does anyone know how to fix this error?
JSON-LD (example page):
<script type="application/ld+json">
{
"#context": "http://schema.org",
"#type": "Review",
"name": "It",
"datePublished": "2017-09-06",
"description": "Based on Stephen King's 1986 novel, […]",
"url": "https://dev.commonsensemedia.org/movie-reviews/it",
"reviewBody": "Based on Stephen King's 1986 novel, […]",
"author": {
"#type": "Person",
"name": "Jeffrey M. Anderson",
"sameAs": "https://dev.commonsensemedia.org/users/jeffrey-m-anderson"
},
"itemReviewed": {
"#type": "Movie",
"name": "It",
"sameAs": "http://www.imdb.com/title/tt1396484/",
"datePublished": "2017-09-08",
"image": {
"#type": "ImageObject",
"url": "image.jpg"
},
"director": {
"#type": "Person",
"name": "Andres Muschietti"
},
"actor": [
{
"#type": "Person",
"name": "Bill Skarsg\u00e5rd"
},
{
"#type": "Person",
"name": "Jaeden Lieberher"
},
{
"#type": "Person",
"name": "Finn Wolfhard"
}
]
},
"publisher": {
"#type": "Organization",
"name": "Common Sense Media",
"sameAs": "https://www.commonsensemedia.org"
},
"reviewRating": {
"#type": "Rating",
"ratingValue": "4"
},
"aggregateRating": {
"#type": "AggregateRating",
"ratingValue": "4.04651",
"bestRating": 5,
"worstRating": 1,
"reviewCount": "43",
"name": "Parents say",
"description": "All parent member reviews for It"
}
}
</script>

Answer 1

When you add the aggregateRating property to the Review item, the aggregated rating is for the review, not for the reviewed item.
If the aggregated rating is for the reviewed item, you have to add the aggregateRating to this item (e.g., Movie).
If that is what you want, you can move the aggregateRating under Movie, e.g.:
{
"#context": "http://schema.org",
"#type": "Review",
"itemReviewed": {
"#type": "Movie",
"aggregateRating": {
"#type": "AggregateRating"
}
}
}