How To Fix WW026 - Enter a valid MG hierarchy level

SAP Error Message - Details

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 026

• Message text: Enter a valid MG hierarchy level

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WW026 - Enter a valid MG hierarchy level ?

  The SAP error message WW026 "Enter a valid MG hierarchy level" typically occurs in the context of Material Management (MM) or related modules when a user is trying to enter or select a hierarchy level for a material group (MG) that is not valid or does not exist in the system.
  Cause:
  
  Invalid Input: The user may have entered a hierarchy level that does not exist in the system.
  Hierarchy Configuration: The material group hierarchy may not be properly configured in the system, leading to the absence of the expected levels.
  Authorization Issues: The user may not have the necessary authorizations to view or select certain hierarchy levels.
  Data Consistency: There may be inconsistencies in the data, such as missing entries in the hierarchy table.
  
  Solution:
  
  Check Input: Verify that the hierarchy level you are trying to enter is correct and exists in the system. You can do this by checking the configuration of the material group hierarchy.
  Review Hierarchy Configuration: Go to the configuration settings for material groups and ensure that the hierarchy levels are correctly defined. This can typically be done in the SPRO transaction under the relevant MM settings.
  Authorization Check: Ensure that you have the necessary authorizations to access the hierarchy levels. If not, contact your system administrator to grant the required permissions.
  Data Consistency Check: Run consistency checks on the material group hierarchy data to identify any missing or incorrect entries. This may involve checking the relevant tables in the database.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on the material group hierarchy and its configuration.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SPRO for configuration, MM01 for material creation, or MM02 for material changes.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Forums: Consider visiting SAP community forums or user groups for additional insights and solutions from other users who may have encountered the same issue.
  
  If the problem persists after trying the above solutions, it may be beneficial to involve your SAP support team or consult with an SAP expert for further assistance.