Associating EDRs with ECOs

I’m working with Innovator 11.0 SP15 and I have installed the Product Engineering 11.0R4 add-on and I’m working with Express ECO and Express EDR items. When I create an EDR, I try to click the ‘Link for ECO’ link to associate an ECO, but it has no effect. Also if I go into an Express ECO and items to it’s Impact Matrix, I am not able to modify or add anything under the EDR Grouping. This has left me unable to create any associations between EDRs an ECOs. Is there another way to do so?