The problems I was experiencing was due to DATAPATH problems.
Now I have
SATRL2E TRLE LNCTL=MPC,READ=(0404),WRITE=(0405),DATAPATH=(0406,408),
PORTNAME=PORTB,
PORTNUM=1,
MPCLEVEL=QDIO
where (0406,408) are now sequential ( they have to be 2 apart ... or possibly even)
with (0406,0407) it fails for me
If this is a requirement to be even or not adjacent, it feels like a bug, and there should be a better error message than
IST1578I DEVICE INOP DETECTED FOR PORTB BY ISTTSCMA CODE = 104
EZZ4338I ERROR REPORTED ON INTERFACE JFPORTCPA - CODE 80100040
DIAGNOSTIC CODE 03