In one of our environments 'Custom target systems' menu is missing in Manager. 
I think that it is covered by TSB module. In Manager->Help->Info I can see 
Module in use TSB no
In working environment is says "yes". 
I tried to import it following insctruction support.oneidentity.com/.../how-to-import-a-new-module-into-an-existing-identity-manager-installation 
but all forms display "Target System Base Module" as selected and greyed out.
We have TargetSystem\UNS parameter enabled. I tried to restart Manager application and recompile database, but it did not help
We are using 8.0.2 version