How To Fix OE891 - Missing unit of measure for documenet with external no. & position &

OE891 - Overview

• Message type: E = Error

• Message class: OE - IS-Oil: ITA/TPI messages

• Message number: 891

• Message text: Missing unit of measure for documenet with external no. & position &

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message OE891 - Missing unit of measure for documenet with external no. & position & ?

  The SAP error message OE891 indicates that there is a missing unit of measure (UoM) for a document with a specified external number and position. This error typically occurs in the context of logistics or inventory management when trying to process a document (like a purchase order, sales order, or delivery) that requires a unit of measure but does not have one defined.
  
  Cause:
  
  Missing Unit of Measure: The most common cause is that the item in the document does not have a unit of measure assigned to it. This can happen if the material master data is incomplete or if the unit of measure is not specified in the document.
  Incorrect Material Master Data: The material may not have been set up correctly in the material master, leading to missing or incorrect UoM settings.
  Document 
  Configuration Issues: The document type or configuration may not be set up to handle the unit of measure