# Parcel line items

Parcel line items track the SKUs in the related [parcel](https://docs.commercelayer.io/core-api-reference/parcels).

* If a stock line item in a shipment is not split, the parcel line items correspond to the stock line item's SKUs.
* If a stock line item is split, the line items are split into more than one parcel line item. A single stock line item can also be split into more than one parcel line item.

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<summary>Data model</summary>

Check the related [ER diagram](https://commercelayer.io/docs/data-model/parcels-and-packages) and explore the flowchart that illustrates how the parcel line item resource relates to the other API entities.

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