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

SAP Error Message - Details

• 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 measure to be omitted.
  
  Solution:
  
  
  Check Material Master: Verify that the material associated with the billing document has a valid unit of measure defined in the material master. You can do this by navigating to the material master record (transaction code MM03) and checking the relevant views (e.g., Basic Data, Sales Org Data).
  
  
  Review Billing Document: Check the billing document (transaction code VF03) to see if the unit of measure is missing for the specific item. If it is missing, you may need to recreate the billing document or adjust the sales order or delivery.
  
  
  Check Sales Order and Delivery: Ensure that the sales order and delivery documents have the correct unit of measure. If there are discrepancies, you may need to correct them in the sales order or delivery.
  
  
  Configuration Settings: Review the configuration settings for the billing document type in the SAP system. Ensure that the settings for unit of measure are correctly defined.
  
  
  Recreate Billing Document: If the issue persists, consider recreating the billing document after ensuring that all related documents (sales order, delivery) are correct.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  MM03: Display Material Master
  VF03: Display Billing Document
  VA03: Display Sales Order
  VL03N: Display Outbound Delivery
  
  
  
  SAP Documentation: Refer to SAP Help documentation for detailed information on billing processes and unit of measure handling.
  
  
  Support: If the issue cannot be resolved internally, consider reaching out to SAP support for assistance, especially if it is related to a bug or a known issue in the system.
  
  
  By following these steps, you should be able to identify and resolve the cause of the MN688 error in your SAP system.