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As of Q3 2022, customer can add custom attributes to the Item catalog provided in SIP apis
Then they enable the publishing of the specific custom attributes which will be seen in event and availability apis.
See API docs
https://developer.ibm.com/apis/catalog/inventoryvis--ibm-sterling-intelligent-promising-apis/Introduction -> Item Assigned Attribute
https://developer.ibm.com/apis/catalog/inventoryvis--inventory-visibility/Introduction -> Publish Attributes
Additionally we would require the Enterprise Code also to be published along with the above mentioned SKU attributes.