Hi Pablo,
I have done the same. I put aM 16 in local directory and uncarred it using user SIDADM. Before that I uncarred using root. But then there was no problem in execution until end.
Two things to be done while runnig SUM on Cluster env:
1) Place archives of SUM in local directory
2) Uncar SUM using the user SIDadm
Thanks,
Sarang.