Using Compuware's Topaz Workbench, when attempting to ADD and GENERATE an element, a S0C4 occurs in Endevor module NDVRC1 in the Topaz STC.
Dump shows that it is expected for BC1PSRVA to run amode24. It swaps to amode 31 when needed.
Normally, RACF ACEE's reside below he line UNLESS the caller of the RACROUTE REQUEST=VERIFY,ENVIR=CREATE which creates the ACEE explicitely (or implicitely) requests it to reside above the line.
Looks like that vendor STC creates ACEE's above the line which we don't seem to support, although nowadays IBM documents that ACEE's "may" reside above the line.
Please contact Compuware, a PTF solving this abend is available.