Hi Alexis,
The shipment cost allocation to deliveries is controlled in the following way-
In LE-TRA (ERP)-
SPRO>Logistics Execution>Transportation>Shipment Costs>Shipment cost document>Shipment cost types and Item categories.
Here the 'Cost Distribution' field in your shipment costs item category controls the distribution level.
In TMS (SCM)-
SPRO>Transportation management>Basic Functions>Cost Distribution>Define Cost distribution profiles.
Here 'Distribution level' controls the same.
BR
narender