Function Module for Updating Freight Order Stages

Hello Experts,

We are integrating with GPS tracking system and its updating our fleet actual position through using the FM /SCMTMS/RES_POSITION_UPDATE  , After this we need to update the Freight order stages with the actual arrival and departure time as to affect and update the /SCMTMS/D_TOREXE.

We need to know the function module used for updating Freight Order stages.