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<title>Invoke</title>
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<h1>Invoke</h1>
<p><img src="../../../images/reference/Details_tab_04.png" alt="Invoke" /></p>
<p><b>Invoke</b></p>
<p>
The Invoke activity requires a Partner Link name and an Operation as defined in the WSDL
for that service. You can use the <strong>Quick Pick</strong> tree control at the right
to select the Partner Link and Operation. For one-way invocations of the service, specify only an Input
Variable; for request-response invocations you must also specify an Output Variable.
</p>
<p>
The checkbox labeled <strong>Use WSDL Message Parts Mapping</strong> provides an alternative to using
variables for the request message.
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