The following abend may appear in ACF2 when manipulating Keyrings:
CCSR010E SVCARECV S0C4 at xxxxxxxx LMOD ACF00SVA CSECT ACF00FLC +00075C
Release : 16.0
Component : ACF2 for z/OS
Incorrect counting on serialized certificate processing.
PTF LU01752 solves the abend.