A warehouse is just an abstraction that does not necessarily relate to a real or physical material storage location. Choose a name for your warehouse that is easy to identify.
Different types of warehouses can be defined as listed below.
Standard Warehouse (with no special usages)
To define a standard warehouse, just enter the warehouse name with its descriptions and select the Use for Issues indicator. Overissues of material (C.20.21, C.20.22, C.20.22.02) are not possible with a standard warehouse.
Overissue Warehouse
To use a warehouse as an overissue warehouse, you have to assign a company to the warehouse. Select a company from the LOV in the Company field; all companies defined on A.10.23 and with the company type SUBCONTRACTOR assigned are available for selection.
Design Change Issue Warehouse
This warehouse type is used for design change issues.
Scrap Warehouse
A scrap warehouse is used by the site inspection feature. Material that does not pass the site inspection will be transferred to the scrap warehouse and will no longer be available to be issued or reserved. For more information about Site inspection, see Site Inspection.
Nested Plate Warehouse
Nested plate warehouses are used for steel plate handling. You can only receive material into this warehouse with a direct MRR by selecting the Plate check box. You can also transfer the steel plates into a nested plate warehouse using MTR. For more information, see Steel Plate Handling.
This indicator cannot be combined with other warehouse types. You cannot assign a company to a nested plate warehouse.
Corporate Warehouse
Usually, when a project has been completed, material is left over that is not needed for the project anymore. To save time and money, this material can be made available to be used in other projects. The Corporate Warehouse (CWH) functionality can be used to manage this remaining material: to take it from the completed project and to make it available to other projects. The corporate warehouse functions as a pool to provide leftover material to other projects. For more information about CWH, see Corporate Warehouse (CWH).
Free Issue Material (FIM) Warehouse
FIM warehouses are used to provide free-issue material. Commonly, this is material that is received from the EPC’s customer and made available for usage. For more information about FIM warehouses, see Free Issue Material Warehouse (FIM).
Rental
A rental warehouse is to be used only for the receiving of rental orders. This warehouse cannot be used for reservation and issue vs. BOM.
You can define warehouses on the C.10.02 Warehouses screen.
To create a new warehouse, enter a name in the Warehouse field and descriptions in the Short Desc and Description fields. Next, select the appropriate indicators to define the warehouse type as described above.
The indicators can only be selected or cleared as long as no material has been received
in the warehouse.
For the use in Mobile Scan, you can specify a warehouse type in the Type field, and a warehouse purpose in the Purpose field.
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The warehouse types and purposes are pre-defined in the C.10.02.02 Warehouse Types and Purposes screen.
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Warehouse type and purpose in combination with the assigned attribute set is used by Mobile Scan to identify the appropriate warehouse when receiving material.
If you have defined a corporate warehouse (CWH), you can assign projects to this CWH. Select the projects to be assigned from the LOV in the Project field in the Assign CWH Projects section at the lower right of the screen.
Only projects that are associated with the same product group as the project of the
CWH can be assigned to the corporate warehouse.
You can use the 
button to assign all available projects to the selected CWH in one step.
The blue background of the Warehouse fields indicates a corporate warehouse from another project.
In the Warehouse Attributes section, you can assign attributes to the selected warehouse. Use the LOV in the Attribute field to select a pre-defined attribute from the list. All attributes defined on A.50.01 are available for selection. The Unit Code will be populated from the attribute definition. If an LOV was defined for the selected attribute, you can use this LOV in the Attribute Value field to select a value. Otherwise, you can enter a value manually or keep it blank.
Warehouse attributes can be used to describe a property of the material stored in the warehouse. For example, if you use warehouses to separate the material by a paint specification, you would assign an attribute like PAINT_SPEC to each of the warehouses and assign values like 'RED', 'GREEN', or an empty value for unpainted material.
Another purpose of the warehouse attribute is to hold the delivery designation of the warehouse. If this attribute is assigned to the project default ZC_DLVATTR, only PO numbers with a routing method assigned for this delivery designation can be selected from the LOV when creating MRRs on the C.20.01 MRR by PO screen.
Inventory item attributes / MTO attributes
The source of the inventory item attributes is defined as "GROUP BY" attributes during setup of MTO (R.10.51). Attributes are derived during requisitions creation out of BOM data, using the MATERIAL TAKE OFF job (R.20.01). The resulting requisition line items are split up for each distinct value of such an attribute. These attached attribute values are carried through the entire workflow. You can view them as attached attributes on several requisitioning, procurement, and site screens.
MTO attributes will become inventory item attributes when the project default ZC_RCVATTR is set to Y. If this project default is set to N, the group-by attributes are not taken into account when the MRR is posted. This means that item shipments with the same idents but different group-by attribute values are added up and placed on the same inventory item.
Warehouse attributes can also be used in connection with forecast/reservation runs as a material selection criterion. For more information, see Forecast Run.