How To Fix ME791 - Order units differ

ME791 - Overview

• Message type: E = Error

• Message class: ME - Purchasing: General Messages

• Message number: 791

• Message text: Order units differ

What causes this issue?

The supplier has sent you an order acknowledgment relating to purchase
order no. &V1&, item &V2&, via EDI. However, the order unit specified in
the IDoc differs from the one shown in the PO.

How to fix this error?

Check the order units in the IDoc and in the purchase order:
<DS:TRAN.ME23N>Display purchase order</>.
If necessary, change the purchase order.
Or get the supplier to change the IDOC.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ME791 - Order units differ ?

  The SAP error message ME791 ("Order units differ") typically occurs in the context of purchasing or inventory management when there is a mismatch between the units of measure for an order and the units of measure defined for the material or product in the system. This can happen during various transactions, such as creating a purchase order, goods receipt, or inventory transfer.
  
  Cause:
  
  Unit of Measure Mismatch: The unit of measure specified in the purchase order or transaction does not match the unit of measure defined in the material master for the item.
  Conversion Issues: If there are conversion factors defined between different units of measure, they may not be set up correctly, leading to discrepancies.
  
  Configuration Issues: The settings in the material master or purchasing info records may not be aligned, causing the system to flag the difference.
  Document Type Settings: Certain document types may have specific requirements for units of measure that are