How to start a design interface for SAP HR

1. Define the trigger that marks the sending of the IDoc (that can be a NAST record, a workflow event or a direct call to function MASTERIDOC_DISTRIBUTE)
2. Define the IDoc types and message types to use (WE30/WE31)
3. Define a function module that creates the IDoc (unless you use a standard one) (SE37)
4. Define partner profiles for outbound in WE20
5. Test the sending and monitor results with WE02

Generally speaking: Interface design is mainly a developer's job, so you should get assistance of a developer if you are not familiar with it by yourself. The debugger is the most valuable tool in IF design. Technical background can be found in the "R3 Guide to EDI and Interfaces."