TPX reports LPAR N/A despite it being available

Document ID : KB000097934
Last Modified Date : 24/05/2018
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Question:
After trying to run TPX on a second LPAR, even though the second started task was stopped, the APTPX VTAM task was active on both LPARS.
When I varied the non-production APTPX task inactive, the non-production LPAR instantly became available.
I need to understand why this happens and how to prevent it.
Environment:
TPX / VTAM
Answer:
This WILL cause unpredictable results, since there would be multiple LUs with same name in the network. You can only have one node activate on one host at a time unless the LU names (APPLs in this case) have symbolic that would make them unique on each host.