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If your question relates to MainView for JAVA and compatibility with z/OS V2.3, you should be fine, although the MainView infrastructure, depending on what version you are running will require PTF(s).
MVI V6.3 - RTCS 2.1 requires BP00359
MVI V6.2 - Review RSL1801/1801C for z/OS 2.3 related PTFs.
Requires PTFs BQI2394, BQI2298, BQY1298, BQY1405, BQY1428, BQI2343, BPA1832 - RTCS 2.1 requires BP00359.