KB2136: vCenter Migration Utility - Veeam Software
https://www.veeam.com/kb213608.06.2016 · Cause Veeam Backup & Replication tracks Virtual Machines in its jobs by their Managed Object Reference ID (MoRef ID), which will change when a VM is moved to another vCenter, a new vCenter Database is used, or the VM is removed and re-added to vCenter inventory. Solution The Migration Tool is available here.