Hello from Amazon Selling Partner Support,

We understand that you contacted Amazon about FBA inventory in reserved status for FNSKU --- . Find the investigation outcome below. 

Tha unfulfillable unit is now sellable and available for customer order. You may view this information via this link: 
https://sellercentral.amazon.com/inventoryplanning/manageinventoryhealth?sort_column=product_details&sort_direction=asc&sort_column_sub=msku&search=X003BJ97UH

To learn more details about reserved inventory, go to:
https://sellercentral.amazon.com/gp/help/G201723860?referral=A2RJV9DLX57LKO_A1EQ5B1AD6OXH1

To resolve questions and actions related to any issues with FBA reserved inventory, go to self-service tool:
https://sellercentral.amazon.com/help/hub/solution/DA_ReservedInventory