[opensuse-buildservice] weird conflict resolution in OBS

This project/package is expected to be in state 'unresolvable': home:olh:mpi/x openSUSE_Tumbleweed x86_64 unresolvable: have choice for openmpi-runtime-config needed by openmpi: openmpi2-config openmpi-config But for some reason "openmpi-config-1.10.7" is silently selected. Doing the exact same thing in Packman fails as expected, because Factory lacks a Prefer for openmpi. Why does OBS select 'openmpi-config' without a "Prefer: openmpi-config"? Olaf