I managed with some difficulty to land that station on Minmus : http://kilobug.net/ksp.png

But it doesn't validate the contract "build a new outpost that has an antenna, a docking port and can generate power", does anybody knows why ?

It has a docking port between the landing engines/legs, just under the big solar panel, it has an antenna just in front (which works fine, transmitted a lot of science with it) and many solar panels, big and small.

Is it set to "Outpost" type via right-click on capsule, rename? Then perhaps wait until its day ("generate power")?

Is it a new craft? It must have been launched after accepting the contract to be valid.

Thanks, that was it ! Didn't know that the game really cared about the type.