Hopefully this will save somebody a few hours..
I had a stored procedure that returned a results set
DECLARE C1 CURSOR WITH RETURN FOR
FROM SYSIBM . SYSDUMMY1 ;
WORDERNUMBER is a variable set inside the proc.
When the proc was originally compiled, the system assigned a generated name
of "00002" to the column in the result set
Recompiling at 7.1 TR7 and the column is now named WORDERNUMBER.
Which caused a bit a a problem for the client app consuming the result set
I haven't (yet) opened a PMR, but I'm guessing IBM would respond that it
was a bug in v5r4 that was fixed. Not sure if the MTU calls out the
change. I'll look back over it later.