IBM SC34-6814-04 - Manual (Page 688)

If you write your own security exit program, it should return all fields other than
userid
and return_code unchanged, or unpredictable results will occur.
DFHEBURM
DFHEBURM is for use with the EJB Bank Account sample program. It alters the
user ID under which the sample runs from the default CICS user ID to “SAMPLE”.
For more information about DFHEBURM, see The EJB Bank Account sample
application, in the Java Applications in CICS.
666 Customization Guide