QuickBooks Online Sync Error: Invalid Reference Id : Name(s) element not found

Steps to update and retry the sync in Ramp:

1. Go to Accounting → Ready to Sync.
2. Mark the affected items as Not Ready so you can edit them.
3. In the QuickBooks Customer field, select an option from the dropdown, even if it is the same customer.
4. Mark the items as Ready for Sync again and retry the sync.