from here questions are also asked in the certification exams, so here's a point-wise rant:-
If you have a warehouse with random storage, you need to use the WM System with full functionality. Since a material can be stored in different storage bins or even several storage bins at the same time, precise inventory management at the level of the storage bin is required.
 Lean WM does not have inventory management at the level of the storage bin and is therefore more suitable for fixed bin warehouses. In a fixed bin storage area, the material is always in the same storage bin.
 To print the storage bin in the picking document, you must maintain the respective data in the material master in the view "Storage 1". Maintenance of further warehouse data and the Warehouse Management views is not required.
 Some of the WM functions not included in Lean WM are listed below:
 Storage sections
 Reserve storage bins
 Strategies for putaway and picking
 Replenishment
 Inventory at storage-bin level
This considerably reduces implementation effort.
 For Lean WM you need at least one warehouse number and at least one storage type from which picking takes place and one storage type in which goods are stored (for example, picking storage type as source storage type, shipping zone as destination storage type).
 In the picking storage area, you can have storage bins grouped together from the stock removal viewpoint (for example, to distribute the workload evenly). Picking areas can be defined for each warehouse number and storage type.
 In addition to the picking area, there are other organizational units in the warehouse. These are the staging areas and the doors. They are defined in the outbound delivery or determined by the system and they can also be printed out on the picking documents.
 You can activate Lean WM in Customizing at the warehouse number level.
 You assign a warehouse number to a combination of plant and storage type. In this way, the organizational units in the warehouse are linked up to MM Inventory Management. Also, through this assignment, a status for WM activities is assigned to the respective items in the outbound delivery.
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