Changing the Serial Flag from Y (Serialized) to N (Not Serialized)

Serialized Inventory (SI) > Serialized Inventory Overview > Serialized Inventory Options > Changing the Serial Flag after Item Setup

Changing the Serial Flag from Y (Serialized) to N (Not Serialized)

You may not change the serial flag in the Catalog record from Y to N in the Catalog Manager if any inventory transactions have been processed for the item.