Taking that article, as an introductory step to the module Materials Management "MM". It will
be your guiding article to build the base knowledge in that module. It will help you to put
yourself on the track of diving deeper vertically in all the topics, that will be listed below.
SAP stands for (Systems, Applications and Products for Enterprise data processing). For SAP
MM, It is an ERP system that deals with procuring, processing and production of materials with
transactions such as Purchase Order (PO), Purchase Requisition (PR), Contracts, Inventory
Valuation, Vendor Management and Materials Requirement Planning. SAP MM is related to
the SAP ERP Logistics system. Each system needs data. For SAP MM it needs data related to
the materials, vendors, plants, storage locations and inventory management. That data is
called Master Data.
Let's have the cycle of SAP MM in a form of a story:
It is starts with a user requesting to purchase materials and services through manual or
automated processes in the form of a Purchase Requisition (PR). After getting the approval on
that request from the purchasing department. These PRs are converted to Purchase Orders
(PO).
It can be considered as an external purchasing document, that will be sent to the vendor.
Vendors are now aware with the material required. Receiving the material in our stock is the
process of Goods Receipt (GR). Invoices will be created by the vendor, and the payment will be
done.
Receiving goods from vendors make it subject to be tested for quality. The quality needs to be
good, so the goods won't return back to the vendor. Having the quality checked, and
everything is good. The goods will be sent to the stock.
In SAP MM, The highest level in the org. structure is the "Client". Inside the client, there can be
multiple company codes, which are the legal entities within the org. structure. Inside these
company codes, there can be multiple plants. Inside the plants, there can be multiple storage
locations, which are used to differentiate between the materials stored. There are also
purchasing organizations and purchasing groups within the org. structure.
Let's discuss the Material Master Data within SAP MM:
Material Master Data contains all the data related to the material characteristics. To create a
material master, some information is required such as the "Industry Sector" and "Material
Type". Each material has a certain number. It can be external or internal according to the
numbering system in the configuration. The data of each material are divided in the form of
views. Simply views can be considered as multiple tabs, where each tab has a name and it
contains information about the material. The name of the view is descriptive enough to be able
to know the type of data exists within the view. The t-code used to access the material master
data is "MM01".
Let's discuss the Material Types:
Material type is a way of definition for the criteria of the material. It can be used to
differentiate between materials through the supply chain process. It is an identifier with four
characters. We can have some examples of commonly used material types.
Material Types can be Finished Products (FERT). It is type of products produced in-house, as it
cannot be ordered by purchasing. Based on that it has no purchasing view in the material
master record. Another material type can be Raw Materials (ROH). It is type of material that is
procured externally then used according to the need of the organization. It contain purchasing
view, but it doesn't contain sales as it cannot be sold. Another material type Semi- finished
Products (HALB). It is type of material can be procured externally, and manufactured in-house.
It can contain normally the purchasing view not as the Finished Products material type, as it
can be procured externally.
Let's discuss the Pricing Conditions:
They are elements that contain the pricing and discounts information about a material from
the vendor. It is important for the purchasing department to know the price of the material to
get it at the appropriate price. Cost of the material contain components such as the gross
price, discounts, taxes and shipment costs. That cost impacts the net and effective price.
Conditions help to identify the cost components, and calculate the net or effective price.
Conditions can be time dependent and non time dependent conditions. Time dependent
conditions have a defined period of time, which it is duration of applicability of the condition.
Time dependent conditions can be used of purchase documents such as (PO, PR, etc.), while
non time dependent conditions can be used in the info records. Info records are used to link a
material to a vendor and price. It can be at the plant or purchasing organization level.
Let's discuss the Account Assignment Category and Item Category:
Account Assignment Category is used to categorize different needs of materials, and services.
Different kinds of account category are needed for cost objects such as assets, production
orders and cost centers. It can differs according to the requirements of Goods Receipt and
Invoice Receipt. Let's have some examples for more clarification. Regarding the assets, the
main asset number, and sub numbers are required. Regarding the cost center, the cost center
number and G/L account number are required for account assignment.
Item category identifies the way of procurement for the material or the service. Some
examples of item categories, It can be standard, consignment, subcontracting, stock transport
order, and third party type.
Let's discuss the Inventory Management in SAP MM:
Inventory management is used to store, and issue the goods. Goods have shelf life time, which
is the expiry date of the goods. It is important to put them in batches, so all goods with the
same expiry date should be kept together in one place. There are many activities included in
the inventory management such as Managing Goods Receipts (GRs), Goods Issue (GI), physical
inventory, Goods Return Management, Batch Management, Material Valuation, and Stock
Transfer.
There are three different types of material statuses. The Unrestricted-use stock, It is where
materials can be used and transferred normally. The Inspection Stock, It is where materials are
inspected to check it's quality. The Blocked Stock, It is where materials can be transferred to
inspection or unrestricted use.