How To Fix VN128 - Partner data incomplete (Partner number is missing)

SAP Error Message - Details

• Message type: E = Error

• Message class: VN - Nachrichtensteuerung

• Message number: 128

• Message text: Partner data incomplete (Partner number is missing)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message VN128 - Partner data incomplete (Partner number is missing) ?

  Certainly! Here's a detailed explanation for the SAP error message VN128 - Partner data incomplete (Partner number is missing):
  
  Error Message:
  VN128 - Partner data incomplete (Partner number is missing)
  
  Cause:
  This error occurs when the system expects partner data (such as vendor, customer, or other business partner) to be entered in a document or transaction, but the partner number field is left blank or missing.
  In SAP, many transactions require partner information to be complete for processing. For example, in purchasing documents (like Purchase Orders), sales documents, or vendor master data maintenance, the partner number is mandatory to identify the business partner involved.
  Common scenarios causing this error:
  
  Partner number field is not filled in during document creation.
  Partner determination procedure is not correctly configured, so the system does not automatically propose a partner.
  Partner role is assigned but the partner number is missing.
  Data entry error or incomplete master data.
  
  
  Solution:
  
  
  Enter the Partner Number:
  
  Check the transaction or document where the error occurs.
  Make sure the partner number field is filled with a valid partner number (vendor, customer, or other partner).
  
  
  
  Check Partner Determination Procedure:
  
  Verify the partner determination procedure assigned to the document type or business transaction.
  Ensure that the partner roles and partner functions are correctly configured.
  If automatic partner determination is expected, check if the partner determination procedure is active and correctly set up.
  
  
  
  Maintain Master Data:
  
  Ensure that the partner master data exists and is active.
  If the partner number is missing because the partner does not exist, create or maintain the partner master record.
  
  
  
  Review Customizing Settings:
  
  Go to SPRO ? Logistics General ? Business Partner ? Partner Determination ? Set Up Partner Determination Procedures.
  Check if the partner roles and partner functions are properly assigned to the relevant document types.
  
  
  
  Check User Input:
  
  If the partner number is supposed to be entered manually, train users to enter the correct partner number.
  Implement input checks or validations to prevent missing partner numbers.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  Vendor Master: XK01, XK02, XK03
  Customer Master: XD01, XD02, XD03
  Purchase Order: ME21N, ME22N, ME23N
  Sales Order: VA01, VA02, VA03
  
  
  
  Partner Determination:
  
  Partner determination is a mechanism in SAP to automatically assign partners to business documents.
  It is configured in IMG under Logistics General ? Business Partner ? Partner Determination.
  
  
  
  Notes and SAP Help:
  
  Refer to SAP Note related to partner determination errors.
  SAP Help Portal: Search for "Partner determination" and "VN128" for detailed documentation.
  
  
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Partner number missing in partner data field.
  
  
  Effect
  Document processing halted due to incomplete partner data.
  
  
  Solution
  Enter valid partner number; check partner determination setup; maintain master data.
  
  
  Where to Check
  Document entry screen, partner determination customizing, master data.
  
  
  
  
  If you provide the specific transaction or context where this error occurs, I can help with more tailored steps.