I'm trying to update an existing record for functional objects using the Smart Data Migration Manager (DMM) tool. I've mapped the Equipment Object Seq field to the legacy source, but when I deploy from the deployment container, it treats it as a new INSERT and returns an error saying the functional object already exists.

I've included all the configuration details and data in the description. Could someone help me identify what I might be missing or doing incorrectly?

Excel Record I’m trying to Update :

Legacy Data :

Mapping : 

Deployment Container :

Error;