I already have the answer: we have to change the "TP API TYPE" from COMPATIBLE to EXTENDED, on Change/Show Transaction Program Load Information panel, using SMITTY.
I am running Communications Server 6 and MQSeries v5.2.0.1 on AIX 4.3.3 env., trying to connect to OS/390. My sender channel (AIX) is up and running but when I try to start OS/390 sender channel, the ...