How To Fix MM091 - Changing the quantity/value update may cause inconsistencies

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 091

• Message text: Changing the quantity/value update may cause inconsistencies

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 MM091 - Changing the quantity/value update may cause inconsistencies ?

  The SAP error message MM091, which states "Changing the quantity/value update may cause inconsistencies," typically occurs in the Materials Management (MM) module when there is an attempt to change the update settings for a material that has already been posted in the system. This can happen when you try to switch between quantity-based and value-based inventory management or vice versa.
  Cause:
  
  Inconsistent Data: The primary cause of this error is that the material has already been used in transactions that are based on a specific update type (quantity or value). Changing the update type can lead to inconsistencies in inventory valuation and reporting.
  Existing Transactions: If there are existing purchase orders, goods movements, or inventory postings that have been recorded against the material, changing the update type can disrupt the integrity of the data.
  Configuration Settings: The error may also arise from incorrect configuration settings in the material master record.
  
  Solution:
  
  Review Material Master Settings: Check the material master record to see the current settings for quantity/value update. You can do this by navigating to the material master in transaction code MM03.
  Avoid Changing Update Type: If the material has already been used in transactions, it is generally advisable not to change the update type. Instead, create a new material master record with the desired settings if necessary.
  Consult with a Functional Consultant: If you believe that a change is necessary, consult with an SAP MM functional consultant or your SAP support team. They can provide guidance on the implications of changing the update type and help you assess the risks.
  Use Transaction Codes: If you need to check or change the settings, you can use transaction codes like MM02 (Change Material) to review the material settings, but be cautious about making changes.
  Documentation and Backup: Always ensure that you have proper documentation and backups before making any changes to the material master settings.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error message. SAP frequently updates its knowledge base with solutions for common issues.
  Training and Documentation: Ensure that users involved in material management are trained on the implications of changing material master settings and the importance of maintaining data integrity.
  Testing in Sandbox: If you are considering making changes, it is advisable to test the changes in a sandbox environment before applying them to the production system.
  
  By following these steps, you can address the MM091 error and ensure that your material management processes remain consistent and reliable.