Identity values on Z/OS

We have used identity values for years on DB2 UDB on Windows. They haven't used on DB2 for Z/os before today, they tend to like timestamps there....

Anyway - are there any gotchas with identity values on Z/os? My usual code run immediately after an insert to the that ID value just returns null - I tried in ASP.NET and through WinSQL.

usually run something like:
select sysibm.identity_val_local as myval
from sysibm.sysdummy1

right after the update and get that id. A cursory glance at the table looks like the identity column is defined correctly by our DBA.

Any ideas? Is this handled differently on Z/OS?

thanks,

fv