How To Fix MR079 - Choose a class type for grouping together plants

SAP Error Message - Details

• Message type: E = Error

• Message class: MR - Stock overview for generic materials

• Message number: 079

• Message text: Choose a class type for grouping together plants

What causes this issue?

Several class types are defined for application 04 (stock overview) in
Customizing for <LS>Basic Data Retail</> under <LS>Applications</>. You
can use these class types to group together plants in the
classification system.
Depending on the class type you used to create your plant groups for
the stock overview, you must choose the corresponding class type here
so that the required assignment of plants to plant groups can be
determined.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Choose one of the class types offered. The system uses this class type
to determine the base plant groups for which the stock data of the
plants assigned is totalled.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MR079 - Choose a class type for grouping together plants ?

  The SAP error message MR079, which states "Choose a class type for grouping together plants," typically occurs in the context of Material Management (MM) when you are trying to create or modify a material master record or when dealing with classification in SAP.
  Cause:
  This error usually arises when the system expects you to assign a class type for the classification of materials across different plants, but no class type has been specified. Class types are used in SAP to categorize materials and can be essential for various functionalities, including reporting and material management.
  Solution:
  To resolve the MR079 error, you can follow these steps:
  
  
  Access the Classification System:
  
  Go to the transaction code CL02 (Change Class) or CL01 (Create Class) in SAP.
  
  
  
  Define Class Type:
  
  Ensure that you have defined a class type that is appropriate for your materials. You can create a new class type if necessary.
  Make sure that the class type is set up to allow grouping of plants.
  
  
  
  Assign Class Type to Material:
  
  When creating or changing a material master record (transaction code MM01 or MM02), ensure that you select the appropriate class type in the classification view.
  If you are using a specific class type for grouping plants, ensure that it is correctly assigned.
  
  
  
  Check Configuration:
  
  If you are an SAP administrator or have access to configuration settings, check the configuration for the classification system in the IMG (Implementation Guide) under:
  
  Logistics - General -> Classification -> Define Class Types
  
  
  Ensure that the class type is correctly configured to allow for plant grouping.
  
  
  
  Consult Documentation:
  
  If you are unsure about which class type to use, consult your organization's documentation or reach out to your SAP support team for guidance on the appropriate class types for your materials.
  
  
  
  Testing:
  
  After making the necessary changes, try to create or modify the material master record again to see if the error persists.
  
  
  
  Related Information:
  
  Class Types: Class types in SAP are defined in the classification system and are used to categorize objects (like materials) based on characteristics.
  Material Master Record: The material master is a central repository of information about materials in SAP, and it is crucial for various processes in logistics and production.
  Transaction Codes:
  
  MM01: Create Material
  MM02: Change Material
  CL01: Create Class
  CL02: Change Class
  CL03: Display Class
  
  
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP Notes for any specific patches or updates related to this error.