Vantage 8.0 Engineering Workbench

We are currently attempting to implement Vantage 8.0. We recently had
our company data imported into the Vantage database. We cannot get
parts unchecked from an ECO group. Each time we open the ECO groups we
get errors. How do we go about resolving an error like this? Has
anyone else on 8.0 had problems/errors in the Engineering Workbench,
and if so how did you get them resolved?

Thanks in advance for any help you can offer!