Hi Naomi,
The assignment from InfoObject 0WBS_ELEMT to InfoObject ZXWBSELMT is not automatically proposed since the InfoObject technical names are different. Here a manual action is necessary: either draw a line from 0WBS_ELEMT to ZXWBSELMT or define a new rule for InfoObject ZXWBSELMT (rule type "Direct Assignment" with source InfoObject 0WBS_ELEMT). After that activate the Transformation and activate the DTP.
In my example this was the only manual assignment which I had to make, all ohers were automatically proposed. I expect this is the only missing piece.
Best regards,
Sander