How To Fix AH491 - Units of measurement do not match

AH491 - Overview

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 491

• Message text: Units of measurement do not match

What causes this issue?

You have entered an inadmissible discount or price in fact maintenance.
Unit of measurement &v2& for the operand &v1& in the facts is different
to the unit of measurement &v3& for the discount or for the price.

System Response

How to fix this error?

Choose an appropriate discount or price using the input help in the
field <LS>Discount</> or <LS>Price</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AH491 - Units of measurement do not match ?

  The SAP error message AH491, which states "Units of measurement do not match," typically occurs when there is a discrepancy between the units of measurement used in different parts of a transaction or document. This can happen in various scenarios, such as when creating purchase orders, sales orders, or during inventory management.
  Causes of AH491 Error
  
  
  Mismatched Units: The most common cause is that the units of measurement for the materials or products involved in the transaction do not match. For example, if you are trying to order a product measured in kilograms but the system expects it in grams.
  
  
  Conversion Issues: If there are conversion factors defined for the units of measurement, and they are not set up correctly, this can lead to mismatches.
  
  
  Material Master Data: The material master data may have inconsistent unit definitions. For instance, the base unit of measure might differ from the unit of measure used in the