Issues have arisen surrounding attempts to have a proxy table in one instance of CIS reference a proxy table in another instance. Version 12.5 addresses those issues, allowing cascading proxy table configurations between any number of instances of CIS.
There are obviously conditions where this can cause problems, such as circular references, or transactions in which the second proxy table references a local table on the same server as the first proxy table. In this case, application deadlocks can result that will not be detected by CIS. Configuring systems to avoid these potential pitfalls is left to the customer.