not able to see receiver while making in messgae type in bd64

Hi Experts,

I am trying to make ALE seetings between 2 different ECC systems

since server of both ECC system are different(including client), I have created 2 LS, connection bw LS and Client, 2 RFC destination.

But when I am trying to add the MT in BD64 in sender ECC.. I cannt see LS of  my receiver ECC (which is quiet logical).

same goes for the receiver side. there I am not able to add the sender logical system

So what should I do??

How can I add my receiver ECC ??

Pls help!!