Storage Locations in TRs, TOs and Posting Changes 
Storage Locations in TRs, TOs and Posting Changes
Use
If you plan to store and manage the stock of several storage locations in the same warehousing complex, you can assign any number of plant/storage location combinations to the same warehouse number.
Reasons for doing this include:
For more information about the structure of storage location assignment to plants and warehouse numbers, see
Overview: The Warehouse Structure in WM.Prerequisites
When you assign several storage locations to a warehouse to display the ownership status of the companies for the goods stored, and the goods movements between storage locations are initiated solely via IM postings, no further Customizing settings are required. You only need to assign the storage locations to the respective warehouse number.
To uniquely identify stock in WM when taking physical inventory, for example, you sometimes need to enter the storage location in addition to the plant.
The system also supports scenarios in which the system manages stock in interim storage areas in different storage locations in a different manner than it manages the stock in the warehouse. For example, this may occur in an independent storage area in production or when you need to separate stock during when it is received for putaway using special storage locations.
In such scenarios, there are putaway and picking requirements for a storage location for which there is no stock in the warehouse. In this case, you need to determine the storage location to which the stock belongs and then generate posting changes for the respective stock between the different storage locations involved in the IM component.
Such posting changes can either be processed immediately (and automatically) after confirming the transfer orders or they can be processed accumulatively using a batch run of the report RLLQ0100. If an error occurs, you can define a user who will be informed by a mail message. This person can then execute the posting change manually using the transaction LQ01.
To activate these functions, additional settings in Customizing to control storage locations and posting changes are required.
Storage Location Reference
To simplify the control per storage location, you can assign an arbitrary 2-digit selectable storage location reference to the plant/storage location combination. This storage location reference is used in the following two instances:
The storage location reference is a key field used by the system to determine the WM movement type for an IM posting If you have similar goods movements for different storage locations, the system can post these movements to different interim storage areas.
The storage location reference is a key field in the storage type search table in Customizing. This makes it possible for you to control different storage types for both putaways and picks based on the storage location.