Problem description
The inventory that is specified by the Id node in the PutBucketInventory request already exists.
Causes
The ID of the inventory that you want to configure by initiating the PutBucketInventory request is the same as the ID of an inventory that is already configured for the bucket.
Examples
You can configure multiple inventories for a bucket. However, the ID of each inventory must be globally unique.
Solutions
Change the value of the Id node in the request and make sure that it is globally unique among the inventories configured for the bucket.