ACF2 r16 with JES3, if modifications are made ACFUSX02 can changes be activated without an IPL?   

Document ID : KB000095690
Last Modified Date : 14/05/2018
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Question:
ACF2 r16 with JES3, if modifications are made ACFUSX02 can changes be activated without an IPL?   
Answer:
To activate any changes to ACF2/JES3 modules, after applying Usermod UMJ3999 a JES3 hot start is required.