As of 2024-10, ReverseFulfillmentOrderLineItem.fulfillmentLineItem field is nullable. A ReverseFulfillmentOrderLineItem will not always be associated with a FulfillmentLineItem anymore. The non-null fulfillmentLineItem field on the older API versions will return a graphql error when the fulfillment line item does not exisit.
Learn more about ReverseFulfillmentOrderLineItem on Shopify.dev.
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