Home > @infiniteobjects/shopify-data-manager > AdminTypes > InventorySetOnHandQuantitiesInput > reason
The reason for the quantity changes. The value must be one of the [possible reasons](https://shopify.dev/docs/apps/fulfillment/inventory-management-apps/quantities-states#set-inventory-quantities-on-hand).
Signature:
reason: Scalars['String']['input'];