Have a look into SAP Note 3233696 - SAP GTS Integration in EWM on S/4HANA - How-To Guide - SAP for Me. There you find an attachment with lot's of implementation information for EWM with SAP GTS.
As Carsten said, you need to use transaction /SAPSLL/COMCO_RTR.The whole concept of Commodity Codes and its Data Structure has been changed with S/4HANA. There is no report like /SAPSLL/STAWN_RETRANSFER_R3 needed any more. The transfer is enough.Neve...
