亚马逊产品API请求不检索ParentASIN

Question

我们在产品api中出现了与“ parentASIN”有关的以下问题：

几天前，我们可以检索“ ParentASIN”：

"Item": [{
            {
            "ASIN": ["B01C5ZJ7YW"],
            "ParentASIN": ["B07PM2NYLC"],
            "DetailPageURL": ["https://www.amazon.it/PlayStation-Plus-Card-Hang-Abbonamento/dp/B01C5ZJ7YW?psc=1&SubscriptionId=REMOVED&tag=REMOVED&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B01C5ZJ7YW"],
            "ItemLinks": [{...}],
            "ItemAttributes": [{...}, ...]

现在我们无法获取“ parentASIN”：

"Item": [{
            "ASIN": ["B01C5ZJ7YW"],
            "DetailPageURL": ["https://www.amazon.it/PlayStation-Plus-Card-Hang-Abbonamento/dp/B01C5ZJ7YW?SubscriptionId=REMOVED&tag=REMOVED&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B01C5ZJ7YW"],
            "ItemLinks": [{...}],
            "ItemAttributes": [{...}, ...]

对此我们有点困惑，这是我们使用的请求：

https://webservices.amazon.it/onca/xml?Service=AWSECommerceService&Operation=ItemLookup&SubscriptionId=REMOVED&AssociateTag=REMOVED&ItemId=B01C5ZJ7YW&IdType=ASIN&ResponseGroup=Variations,VariationMatrix,VariationSummary