Transactions subsystem has these attributes:

• use-hornetq-store
• use-journal-store
• use-jdbc store

each of those has the other two set up as alternatives, however "journal" is an alias of "hornetq" and so those two shouldn't be treated as mutually exclusive.

(As far as I know this doesn't break anything because of the way the attributes are handled, but it poses a problem for WFCORE-4287)