Batch input in WDA

Hi, I have to input data to several infotypes through ABAP web dynpros, and batch input was chosen as the means to do it.

I created a Function Module which receives the required data and creates the Batch Sessions, since I can't use "Call transaction...using" in web dynpros.

The sessions are correctly created, I see them if i manually go to SM35, and I can release them if i want.

The last step is releasing the sessions programatically, that is from the WD itself; how do I do this?