How To Fix MM661 - BUoM in additional data of the class must be convertible to material BUoM

MM661 - Overview

• Message type: E = Error

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

• Message number: 661

• Message text: BUoM in additional data of the class must be convertible to material BUoM

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 MM661 - BUoM in additional data of the class must be convertible to material BUoM ?

  The SAP error message MM661 ("BUoM in additional data of the class must be convertible to material BUoM") typically occurs in the context of material master data management, particularly when dealing with units of measure (UoM) in the classification of materials. This error indicates that there is an issue with the conversion between the base unit of measure (BUoM) of the material and the unit of measure defined in the classification data.
  
  Cause:
  
  
  Incompatible Units of Measure: The unit of measure defined in the classification data (e.g., in the classification system or class type) is not compatible with the base unit of measure of the material. For example, if the material's BUoM is in kilograms, but the classification data is in grams, the system cannot convert between these two units without a proper conversion factor.
  
  
  Missing Conversion Factors: There may be no conversion factors defined for the units of measure involved. SAP requires