Description of problem:
The interactive mode of rhui-manager has the following feature:

r   manage repositories ->
a   add a new Red Hat content repository ->
Import Repositories:
  1  - All in Certificate
  2  - By Product
  3  - By Repository

If you enter 2 and select a product which contains multiple repos, all the repos in the product get imported. For example, with the Atomic certificate and the "Red Hat Enterprise Linux Atomic Host (Debug RPMs) from RHUI" product, I get the following repos:

Red Hat Enterprise Linux Atomic Host (Debug RPMs) from RHUI (aarch64)
Red Hat Enterprise Linux Atomic Host (Debug RPMs) from RHUI (ppc64le)
Red Hat Enterprise Linux Atomic Host (Debug RPMs) from RHUI (s390x)
Red Hat Enterprise Linux Atomic Host (Debug RPMs) from RHUI (x86_64)

(The list is sorted.)

(Note: This must be a recent change in the entitlement as there was just the x86_64 repo in the entitlement not long ago. That's also why I haven't encountered this bug before.)

However, the CLI mode behaves differently. Only the first repo from the product gets added. See here:

# rhui-manager repo add --product_name "Red Hat Enterprise Linux Atomic Host (RPMs) from RHUI"
Loading latest entitled products from Red Hat...
... listings loaded
Successfully added Red Hat Enterprise Linux Atomic Host (RPMs) from RHUI 
[root@rhua ~]# rhui-manager repo list
ID                             :: Repository Name

Red Hat Repositories
--------------------
rhel-atomic-host-rhui-rpms-ppc64le :: Red Hat Enterprise Linux Atomic Host (RPMs) from RHUI (ppc64le)

Custom Repositories
...


Version-Release number of selected component (if applicable):
RHUI 3.0.4

Additional info:
The code (rhui/tools/commands/repo.py) reads:

        repos, products = self.candidate_repo_manager.resolve_undeployed()
        create_me = None
        for key, value in products.items():
            if product_name == key:
                create_me = products[product_name].repos.values()[0]

        cert = self.cert_manager.cert_for_entitlement(create_me.entitlement)
        result = self.pulp.create_redhat_repo(create_me, cert.cert_filename,
                                              self.config.get('rhui', 'repo_sync_frequency'))

Why just [0]?