sap pi 7.3 SLD - Business system present,not coming in ID

Hi,

I am in SAP PI 7.3

In SLD i have 4 business systems which i want to use in ID.

But in ID ,when i am going to "Assign Business System" - no business system is shown from SLD. So, I am not able to use communication component in ID.

Can you please help in it ?

(1) Does business system comes in ID from SLD by using "Assign business system"

OR

(2) we have to manually create communication component in ID which is identical to SLD business system ?

Rgds