Can't create new journal in OJS 3.2.1-1

We have recently migrated our OJS 2.4.8 sites to OJS 3.2.1-1
For the most part our instances are all single journal instances.
I understand that in order to access global site level settings, the OJS instance needs to be hosting more than one journal, so the solution is to create a second journal which is hidden from public view. Unfortunately, I can’t seem to be able to create a second journal via the UI. Attempts to do so produce complaints about the journal Path : “The path can only include letters, numbers…” although the path I am using is DUM which meets the requirements listed in the error message.
We are using apache rewrite to present short urls, and for each instance the journal URL and the site level URL are the same. I wonder if this is causing the problem?
Can anyone suggest how to create a second journal so that we can access site-level settings?

Hi @elt,

What if you try not to use capital letters. E.g. dum

Regards, Primož

Thanks indeed for the suggestion primozs. Using lower case letters did indeed work!