We are planning an upgrade of z/OS. Will putting on the upgrade compatibility fixes effect the running system at a lower level of z/OS?

Document ID : KB000014414
Last Modified Date : 14/02/2018
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Question:

We are planning an upgrade of z/OS.  Will putting on the upgrade compatibility fixes effect the running system at a lower level of z/OS?

Answer:

Having on the ACF2 support for multiple releases of z/OS will not effect a running system levels.