This document defines warehouse management (WM) movement types and transfer requirements (TR) in SAP. It explains how to assign inventory management (IM) movement types to WM reference movement types, which determines the corresponding WM movement type. IM movement types not involving WM are assigned to reference type 999. It describes how TR numbers are defined and how manual and immediate TR creation can be controlled based on WM movement types. Finally, it lists some common goods movements that typically result in TR creation, such as transfers between IM and WM locations and goods issue/receipts.