call a sub process synchronously

Content

Hi Folks,

I want to call a sub process synchronously.  I have used  service activity for call  another process synchronously but I don't have option to select synchronous.  Is there any other way to call a sub process?

I have encountered the below warning message when I test the Process.  But Still my main process call a sub process by asynchronously.

Warning Message:

The selected target node in conversation of node Service might not be valid. A target with a synchronous external interface or at least one replier must be selected. Use a Send Task instead

Thanks & Regards,

Seethu