Programming posting change in EWM

Hi folks,

I have the following requirement: create a function module that can perform a posting change in EWM (called up by a background program).

Now I have found the following function module: /SCWM/STOCK_CHANGE, but it is not clear to me how I can fill it up with data. Is there anyone here who knows what function module or method can be used to fill up the import parameters?

When you do the posting change from the UI, all this happens in class /SCWM/CL_UI_POST, but I don't see how I can use parts of this class without the UI elements.

Regards,

Rob