[EXIM] transport returned 137

Hi,
I have written a transport for Exim which puts Mails into an Informix-DB. When I call the executable by hand it works. When I let call Exim the executable it returns:
Child process of sqluser_pipe transport returned 137 from command: /bin/sh

The lines in the exim.conf are:
sqluser_pipe:
driver = pipe
command = "/usr/local/sbin/exim-informix ${local_part} ${domain}"
pipe_as_creator = true
use_shell

The Exe has:
-rwxr-x---   1 informix informix    23144 Jul 28 20:16 
                         /usr/local/sbin/exim-informix*

And should work as user informix.
What have i done wrong?
Thx
    Lars

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