I think you should add/change to a tag for System Center.
I seem to recall though, that it is not supported to have other databases on other instances where there is an SCCM database. But this was something I leanrt 6-7 years ago or more, so this may changed since then.
Actually this problem is more related to the configuration of SCCM & SCO.
Please post your question in System Center on Q&A or edit the current tag. I believe you can get more effective help in the corresponding forum.