This article explains how you can configure your system to avoid an abend U4093 error when running APS for z/OS on the mainframe.
Problem:
When editing an application component in APS z/OS, you receive a User 4093 abend code (U4028), reason code 28 (RC 28).
Resolution:
This abend is caused by a lack of memory resources in the TSO session. The default TSO startup size might be set too low. We recommend a minimum size of 4096. Increase the TSO startup size by entering it into the Size field on the TSO/E LOGON screen as depicted here:
Incident Number: 2266267
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