Hi Harry,
Unfortunately there is no similar statement like EXITCODE for DBSP_JOB. You may post an idea for enhancement request.
As workaround, you may consider use COND on RELEASE statement, like:
DBSP_JOB AAA
.....
RELEASE ADD(BBB) COND(RC(20001))
ENDJOB
JOB BBB LINK PROCESS /* the successor will force complete AAA*/
....
ESPNOMSG AJ AAA COMPLETE APPL(%ESPAPPL..%ESPAPGEN)
ENDJOB
Hope this helps,
Lucy