Rendezvous two vessels not completing

[N_Danger]

 I had sent a mission to Ike. It consisted of a lander and a return vehicle launched together. I un-docked the lander and went to Ike but upon returning to the vehicle in orbit I did not get a contact completion for a rendezvous two vehicles in orbit around Ike. 

 Does this kind of contract require 2 different vehicles to be launched separately? 

[AHHans]

1 hour ago, N_Danger said:

 Does this kind of contract require 2 different vehicles to be launched separately? 

Indeed! For the rendezvous, dock, or crew transfer the two vessels must have been launched in two different launches. But it is O.K. to dock them in LKO, have them travel together to the destination and undock there.

[Echo__3]

Yes, this mission requires two vessels that had been launched separately.