external program execution problem

[Lokotes]

Hi,
I'm executing external script when accounting starts (in acct_users 
file, using Exec-Program-Wait).
My script invokes another script as a background process and continues 
(self)execution.
This works when executing in shell but when radius starts the script, 
radius waits until background script finishes! Why? Shouldn't radius 
wait only for script which was invoked directly by radius?
Hope someone have any idea...
Thanks.
Lokotes

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