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Deprecate FulfillmentOrderLineItem.lineItem field
API
Effective January 01, 2023
As of API version 2023-01, the lineItem field on the FulfillmentOrderLineItem resource has been deprecated. The order line item associated with a FulfillmentOrderLineItem shouldn't be used to determine what to fulfill.
Use the FulfillmentOrderLineItem and FulfillmentOrder objects instead. An order LineItem represents a single line item on an order, but it doesn't represent what should be fulfilled.