How to implement wait activity in OWB process flows?

Hi,
I am using OWB 10G R1.
There is no wait activity in process flows.
My scenario is, whenver a trigger file is created, I want to proceed with the process flow. If the trigger file doesnot exist, then I want to put the process flow in a wait state, until the trigger file is created.
Here I used File_Exists activity. But it is checking for the file only once. And it returns warning.
After that, I want to add an wait activity for certain period of time. How can I do this? Is there is any package,procedure or function to do that?
Any help is appreciated.
Thank you,
Regards,
Gowtham Sen.

Gowtham,
Well the following hint is provided by oracle warehouse builder help.........
The time-out setting for the workflow engine determines how long the File Exist activity waits for a file. If the file does not arrive before the time-out setting expires, the File Exists activity terminates with errors.
well someone with deep workflow knowledge can answer this one...
If you get the answer please share with us.....
Regards,
Suraj.

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Gowtham,
Well the following hint is provided by oracle warehouse builder help.........
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How to implement wait activity in OWB process flows?

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