Login failed when accessing SRM-MDM 3.0 from inside SRM

Dear SRM-MDM experts

We are implementing SRM-MDM 3.0 We have configured the Integrated Call Structure inside SRM correctly using http://Server:port/SRM-MDM/SRM_MDM plus the other settings on the call structure. We have also assigned the Catalog ID to the user on the SRM Org Structure. However, when we click on Shop button in SRM and try to click on the SRM-MDM catalog so as to go in and search for products, the system gets in but gives us a logion screen that requires a Serve Name, Server Password, Repository Name, User Name and Password. But all these things are set up on the Integrated Call Structure? When we put this data manually on that screen, we get error Login failed. Please help. Could there be a setting somewhere on the MDM database that we need to do allow direct to access to MDM from SRM?

Thanks and regards

Pedzi