ETL how to use a XML as input? I cant choose columns

[fozon]

Hello,

I am trying to parse an xml as source in an advanced ETL. I select the file as input but then when I have to choose the columns in the step "Enter Column Properties" I can do nothing. The screen table is empty and I only can click "Back" and "Cancel".

I attach a screen-shoot.

Is there a manual that teaches how to do it?

Thanks,
Gabriel.