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It is highly recommended to have a separate PIA for each environment.
Especially for the correct use of the Integration Broker. One PIA instance can have only one gateway, which can connect to several application servers.
If your PIA is setup to handle all traffic of separate peoplesoft instances (read application server/database DEV/TEST/etc) and especially if your environments have the same node names, the integration broker will route the message to the first instance. This can cause messages from DEV to be sent to TEST and you do not want this. Also from a security point of view, when you use the same node names across environments an you have SSO enabled, this will cause seamless access between DEV and TEST etc.
To keep it short, every environment should have it's own PIA.