even if booked as a UA-(code-share) flight number, LH metal flights (in paid eco, non-transatlantic) will only be credited 50% into your Mileage Plus account.
To show you the LH availability, with the UA booking 'machine', before searching the available flights, just click on LH too as preferred carriers to show up.
(added 'non-transatlantic' after reading leroy's post)
[This message has been edited by Rudi (edited 04-04-2001).]