How To Fix /SAPAPO/MAT832 - UoM category C only allowed, if UoM with category A or B exists

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/MAT -

• Message number: 832

• Message text: UoM category C only allowed, if UoM with category A or B exists

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 /SAPAPO/MAT832 - UoM category C only allowed, if UoM with category A or B exists ?

  The SAP error message /SAPAPO/MAT832 typically occurs in the context of SAP Advanced Planning and Optimization (APO) when dealing with material master data and unit of measure (UoM) settings. This error indicates that a unit of measure (UoM) categorized as "C" is being used, but the system requires that at least one UoM categorized as "A" (Base Unit of Measure) or "B" (Alternative Unit of Measure) must exist for the material.
  Cause:
  
  UoM Configuration: The material master is configured with a UoM of category "C" (which is typically used for conversion purposes) without having a corresponding UoM of category "A" or "B". 
  Data Inconsistency: There may be inconsistencies in the material master data where the required UoMs are not properly defined or missing.
  Master Data Maintenance: The error can also arise during the maintenance of master data in APO, where the UoM settings are not aligned with the requirements of the system.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Material Master Data:
  
  Go to the material master record in transaction MM03 (Display Material) or MM02 (Change Material).
  Verify the UoM settings under the "Basic Data" and "Sales Org. Data" views.
  Ensure that there is at least one UoM defined as category "A" or "B".
  
  
  
  Add Required UoM:
  
  If there is no UoM of category "A" or "B", you need to add one. You can do this in transaction MM02:
  
  Navigate to the "Units of Measure" view.
  Add a UoM of category "A" (Base UoM) or "B" (Alternative UoM) as needed.
  
  
  
  
  
  Check UoM Categories:
  
  Ensure that the UoM categories are correctly defined in the system. You can check this in transaction CUNI (Unit of Measure Conversion).
  Make sure that the UoM you are trying to use is correctly categorized.
  
  
  
  Consistency Check:
  
  After making changes, perform a consistency check to ensure that the material master data is valid and that there are no other related issues.
  
  
  
  Consult Documentation:
  
  If you are unsure about the UoM categories or how to configure them, refer to SAP documentation or consult with your SAP functional consultant.
  
  
  
  Related Information:
  
  
  UoM Categories:
  
  A: Base Unit of Measure (the primary unit used for inventory management).
  B: Alternative Unit of Measure (used for sales, purchasing, etc.).
  C: Conversion Unit of Measure (used for conversion purposes).
  
  
  
  Transaction Codes:
  
  MM03: Display Material Master
  MM02: Change Material Master
  CUNI: Unit of Measure Conversion
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  
  
  By following these steps, you should be able to resolve the error and ensure that your material master data is correctly configured for use in SAP APO.