Can't save subassembly "THE SELECTED PART IS NOT ATTACHABLE!"
When trying to save a 'science prob' (see below image), I keep getting the above message and can't save it.
Action taken to produce result: Build the module (see image), drag and drop the OKTO pod to the 'drop zone'.
What might be the reason and can it be saved?
Best Answer
You definitely need to re-root to the engine where you're attaching (probably a launch vehicle). I ran into this when making a combination of lander and tanker. The lander lands with nearly no fuel on the mun, but launches a tanker to transport fuel and kerbals back to the lander if needed. But now you'll have a mun base that can transport fuel to any similar designed lander (and if you made your mun base correctly, can practically make fuel at will.).
Once I re-rooted to the poodle engine, I was able to save it as a sub-assembly called lander_tanker. I'll let you know my success when I put it on the mun in career mode.
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Images: Eren Li, Nothing Ahead, SHVETS production, Olya Kobruseva