Join two db2 system

I’m working DB2 V7.1 for OS/390.
I’ve two subsystem at two different OS/390 machine(local=DSNT,remote=DSNA).
I want to write a cobol program in one machine and
connect to two systems(local and remote) and make a query.
My programe compiled successfully but when I run it,
it don’t know remote system (DSNA) and has an error like below:

READY
DSN SYSTEM(DSNA)
DSNE110E DSNA NOT VALID SUBSYSTEM ID, COMMAND TERMINATED
READY
BIND PACKAGE(JAMPACK7) MEMBER(TT33) ACT(REP) REL(DEALLOCATE)
IKJ56500I COMMAND BIND NOT FOUND

Can any one help me to correct this problem.