Hi Elodie,
I see... then I have another question: Can the WBS-Element which the Traveler would theoretically have to enter himself somehow be automatically derived from the system? Or does the Traveler simply have to know what WBS element he should enter and there is no way to automatically/programatically support the enduser?
The reason I ask is, if this information cannot be automatically be adapted and you just want to poke the enduser with a warning message "Are you sure you have assigned the correct WBS element?" then you could use BADI TRIP_WEB_CHECK ~ USER_CHECK_TRIP_COSTS_SPLIT to check this and throw a warning message.
Cheers, Lukas