SAP Transaction OMMN: A Comprehensive Guide for SAP Users

Welcome to our tutorial on SAP transaction OMMN, a crucial transaction code used in SAP Materials Management (MM) module. In this tutorial, we will provide you with a step-by-step guide on how to effectively utilize OMMN for managing material master data in your SAP system. Whether you are a novice SAP user or an experienced consultant looking for a refresher, this tutorial will equip you with the necessary knowledge to navigate through OMMN seamlessly.

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Now, let’s begin our tutorial on using SAP transaction OMMN.

What is SAP Transaction OMMN?

SAP Transaction OMMN (Material Master Data Maintenance) is a critical transaction code used in SAP MM to create, change, and display material master data. Material master data contains detailed information about materials used in an organization, such as their description, dimensions, stock availability, and procurement details. With OMMN, you can efficiently manage and update material master data, ensuring accurate and up-to-date information for your organization’s inventory and procurement processes.

Step 1: Accessing SAP Transaction OMMN

To start using OMMN, follow these steps:

1. Log in to your SAP system using your user ID and password.
2. Launch the SAP Easy Access Menu.
3. Navigate to the “Logistics” folder and expand it.
4. Locate and click on the “Materials Management” folder.
5. From the sub-menu, select “Material Master” and click on “Material” to proceed to the OMMN transaction.

Step 2: Understanding OMMN Transaction Screen

Once you have accessed OMMN, you will encounter the OMMN transaction screen, which consists of various fields and tabs. Let’s explore each of them:

• General Data: This section contains the main fields for entering general information about the material, such as material type, base unit of measure, and material group.
• Plant Data/Stor.2: Here, you can view and manage the plant-specific data for the material, such as the storage location, valuation class, and purchasing data.
• Purchasing: This tab provides a comprehensive view of the purchasing-related information for the material, including purchasing organization, purchasing group, and delivery tolerances.
• Sales: The sales tab displays the sales-related information for the material, such as sales organization, distribution channel, and pricing conditions.
• Accounting: In this tab, you can find accounting-related information for the material, such as the general ledger (G/L) accounts and cost centers involved.
• Classification: The classification tab allows you to assign characteristics and classes to the material for better categorization and searchability.
• Additional Data: In this tab, you can enter additional data for the material, such as weight, volume, or hazardous material indicators.
• Texts: The texts tab enables you to maintain descriptive texts for the material, such as long text, internal comments, and external remarks.
• Attachments: This tab allows you to attach documents or files related to the material, such as technical specifications or product images.

Step 3: Creating Material Master Data with OMMN

To create material master data using OMMN, follow these steps:

1. Start by filling in the necessary fields in the “General Data” section:

   • Material Type: Select the appropriate material type for the material you are creating.
   • Base Unit of Measure: Specify the base unit of measure for the material, such as pieces, kilograms, or liters.
   • Material Group: Choose the material group that best represents the category of the material.

2. Move to the relevant tabs (Plant Data/Stor.2, Purchasing, Sales, etc.) and enter the required information for each section based on your organization’s requirements.
3. Once you have entered all the necessary information, click on the “Save” button to create the material master data.

Congratulations! You have successfully created material master data using SAP transaction OMMN.

Step 4: Exploring Additional Functionality

SAP transaction OMMN offers various additional functionalities to streamline your material master data management processes. Here are some notable features you can leverage:

• Change Material Master Data: OMMN allows you to modify existing material master data. You can edit fields such as description, dimensions, or purchasing details. Simply enter the material number and make the necessary changes.
• Display Material Master Data: Use OMMN to display existing material master data by entering the material number and other relevant criteria. This allows you to review and verify the information stored for a specific material.
• Mass Maintenance: OMMN supports mass maintenance functionality, which allows you to make changes to multiple material master data records simultaneously. This feature is particularly useful when updating common information for a group of materials.
• Deletion of Material Master Data: OMMN also enables you to delete material master data that is no longer required. Be cautious when using this functionality, as deleted data cannot be recovered.

Conclusion

In this tutorial, we have provided you with a comprehensive guide on using SAP transaction OMMN in the SAP MM module. We covered the basics of OMMN, explained how to create material master data, and explored additional functionalities. Remember, continuous learning and practice are key to becoming proficient in SAP MM.

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