Urgent: Clarifrication on using WebService with RDA

Hi,

Please someone can clear my concept when using WebService with RDA:

1. In this scenario Data needs to be pushed into PSA from the web service. For this an interface like XI (or some similar) would become mandatory. RDA does not eliminate this interface.

2.Depending on the settings then Daemon will load data via Real Time DTP from PSA to the data target.

Any help appreciated...

Sam