Failed to create virtual server : A MySQL user named moneystationiowa already exists

Ok, so I just recently ran into this issue.

I added a domain (moneystationiowa.com) to my Virtualmin Pro server. NO PROBLEM

This is going to be the commercial/public website for one of my clients.

I'm developing a "web based" software/crm for them to use. They want this to run on a SSL enabled site with a slightly different domain name (moneystationiowa.net)!

When I tried to register moneystationiowa.net I get the following error:

Failed to create virtual server : A MySQL user named moneystationiowa already exists

So...

I remembered that you could assign a different Administration username using the "Custom username" option instead of the "Automatic" option. Using this feature I tried to set the username to moneystationiowanet instead of the default/automatic username of moneystationiowa.

Then I tried again to register moneystationiowa.net and got the same error, exactly!

Both sites need MySQL, but it seems like it is trying to create the MySQL username from the "Domain name" field instead of from the "Administration username - Custom username" field. Or, maybe it is truncating the "moneystationiowanet" in the "Administration username - Custom username" field, to "moneystationiowa" which shouldn't be happening either!

PLZ Advise!