Create customer asset for a serialized item

Summary:

Trying to create a customer asset (IB) for a serialized item. Error message pops up - "A record with the value already exists. Enter a unique value."

Content (required):

Item is set and assigned to two inventory orgs. Item received and serialized. Trying to now create a customer asset record using Asset Lifecycle Management / Manage Asset / Create Asset option.

Upon entering the values as needed including the item number and the serial number - leaving the Asset Number field blank for the system to generate the Asset number - the error message pops up upon saving.

As shown in the attached document.