How To Fix MN688 - Billing doc. unit of measure for item &2 of billing document &1 missing

MN688 - Overview

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 688

• Message text: Billing doc. unit of measure for item &2 of billing document &1 missing

What causes this issue?

The billing document unit for item &V2& in supplier billing document
&V1& is missing.

System Response

The system cannot update the business volume data.

How to fix this error?

Contact your system administrator, as this is probably due to a program
error.
The condition record concerned has (internal) number &V3& for
arrangement &V4&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MN688 - Billing doc. unit of measure for item &2 of billing document &1 missing ?

  The SAP error message MN688 indicates that there is a missing unit of measure (UoM) for a specific item in a billing document. This error typically occurs during the billing process when the system cannot find the necessary unit of measure for one or more items in the billing document.
  
  Cause:
  
  Missing Unit of Measure: The most common cause is that the item in the billing document does not have a defined unit of measure in the material master or in the billing document itself.
  Incorrect Configuration: There may be issues with the configuration of the material or the billing document type that leads to the unit of measure not being populated.
  Data Inconsistencies: If there are inconsistencies in the data between the sales order, delivery, and billing document, it can lead to this error.
  Custom Developments: If there are custom developments or enhancements in the billing process, they might inadvertently cause the unit of