How are you actually checking the SWIA? Just immediately after you've tested the leave request? Then they work items should be visible in SWIA. Can you see any other work items in SWIA (execute it for last month or so.)
I hope that this is not something as simple like this: Your portal is connected to client 200, but you are running the SWIA in client 100 => no result because the work items are created in client 200.
Regards,
Karri
