IBM SC33-1683-02 - Manual (Page 790)

to the user program” on page 743.) However, when DFHCSDUP is invoked
from a user program, the parameter list also includes the standard
parameters mentioned under “Parameters passed to the user exit routines”
on page 755.
Return codes
UERCNORM (X'00')
Continue processing.
UERCERR
Irrecoverable error. This causes DFHCSDUP to terminate with a
return code of ‘8’.
XPI calls
Must not be used.
invoking DFHCSDUP from a user program
758 CICS TS for OS/390: CICS Customization Guide