IBM SC33-1683-02 - Manual (Page 141)

CICS is not to carry out the processing required for the VSAM RLS
action, and is to cancel the action throughout the sysplex.
A return code of UERCPURG is not allowed.
XPI calls
All can be used.
API and SPI calls
You can use CICS API and SPI commands at this exit. In general all can be
used, with the following restrictions:
v You should avoid the use of commands that cause the issuing task to
suspend.
v You must not use the QUIESCESTATE option of EXEC CICS SET
DSNAME for data set UEPDSNAM.
v You must not use the OPENSTATUS option of EXEC CICS SET FILE, or
issue file control requests, for files that reference data set UEPDSNAM.
file control quiesce receive exit
Chapter 1. Global user exit programs 109