one repo multiple channels

Our uyuni installation should patch centos and oracle machines, so I have both kinds of machines. Some of them are using docker packages, so I configured a centos-docker repo, connected to a centos-docker channel. Now I need a oracleos docker channel, with uses the same repo. So I created a oracle channel, connected to the centos-repo, because this repo can be used for both operating systems. In the centos channel I see docker packages, but in the oracle channel I see no package. What is wrong, or how to I connect one repo to several channels? Thank you. Regards, Peter