Activation Groups 102, the plot thickens....

I'm calling a program that runs in activation group A which calls a
procedure in a service program in activation group B.  I end the program,
and then, I do a rclactgrp B and activation group B deletes ok.   I'm still
in the same interactive workstation session and I call the original program
again.  I get kicked off the interactive session with a:

 MCH3402 - A system object is destroyed or has header damage.  This is most
commonly caused by deleting a program that is active in the program stack.
It may also be caused by deleting the event handlers, external exception
handlers, or the program to which the job was routed.

When I follow the same steps, but also do a rclactgrp A, I get no error and
apparently the next call to the original program activates both activation
groups normally.

I don't understand why, when leaving activation group A active in the
interactive session's program stack,  the second call to the original
program doesn't just reinitialize activation group B as soon as it starts
up.   Does this mean  that to do proper cleanup, I would have to always
reclaim all activation groups back to, and including, the original calling
program's activation group?  I was trying to put the cleanup routines at the
end of the initial program in activation group A, but I can't do a rclactgrp
to A, itself, because I'm still in it at that point in time.

Nelson Smith
nsmith@lincare.com
ncsmith@tampabay.rr.com



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