I have an elastic axis "label", with node label "debian-ppc64el,centos-s390x"

What I want is for any 1 node matching debian-ppc64el, AND any 1 node matching centos-s390x, to be used for the build, such that the output is available at the URL http://...blabla/label=centos-s390x/ and http://...blabla/label=debian-ppc64el/

Instead, Elastic Axis has expanded my labels, created http://...blabla/label=s390xbuilder-1-hostname/ and http://...blabla/label=s390xbuilder-2-hostname/ entries, and tries to build on both machines (a waste of time/resources)