Why Non-Consumable product has originalTransactionId?

I try to call Get Transaction Info from App Store Server API, and the transactionId is for a Non-consumable type product, but it is odd that there are so many different transactionId and they have a same originalTransactionId

{
    "bundleId": "${bundleId}",
    "environment": "Production",
    "inAppOwnershipType": "PURCHASED",
    "originalPurchaseDate": 1691220528000,
    "originalTransactionId": "${originalTransactionId}",
    "productId": "${productId}",
    "purchaseDate": 1691220528000,
    "quantity": 1,
    "signedDate": 1692590989925,
    "storefront": "USA",
    "storefrontId": "143441",
    "transactionId": "${originalTransactionId}",
    "transactionReason": "PURCHASE",
    "type": "Non-Consumable"
}

the defination of Non-Consumable is can only purchase once for same apple account. But why there would have originalTransactionId?