We have a program which uses the Application Interface, linking to program TSSCICS. This program is called via the CICS mirror transaction (CSMI). In CICS TS version 4.2, CSMI is defined with DATALOC(BELOW). In CICS TS version 5.1, it is defined with DATALOC(ANY), so we got an AEZC abend because TSSCICS is linked as AMODE 24.
Should it link to TSSCICSN instead since TSSCICSN is linked as AMODE31.
TSSCICS is a stub and will go to TSSCICSN automatically.
If you wish, you can link to TSSCICSN directly.