How To Fix VN321 - Error in calling selection module for partner function &

SAP Error Message - Details

• Message type: E = Error

• Message class: VN - Nachrichtensteuerung

• Message number: 321

• Message text: Error in calling selection module for partner function &

What causes this issue?

The possible entries display function module for partner function
&v1& could not return any values.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VN321 - Error in calling selection module for partner function & ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  VN321 - Error in calling selection module for partner function &
  
  Cause:
  This error occurs when the system tries to call a selection module (a user-exit or function module) assigned to a partner function during vendor master data processing or document processing, but the call fails. The ampersand (&) in the message is replaced by the specific partner function code (e.g., VN, WE, etc.).
  Common causes include:
  
  The selection module assigned to the partner function is not implemented or incorrectly implemented.
  The function module or user-exit assigned to the partner function is missing or has errors.
  Incorrect configuration in the partner determination procedure where the selection module is assigned.
  The function module does not conform to the expected interface or parameters.
  Authorization or system issues preventing the module from executing properly.
  
  
  Where does this occur?
  
  Vendor master data maintenance (transaction XK01, XK02, XK03)
  Purchase order processing or other procurement documents where partner functions are used.
  Partner determination procedures in customizing (SPRO).
  
  
  Solution:
  
  
  Check the Partner Determination Procedure:
  
  Go to SPRO ? Materials Management ? Purchasing ? Partner Determination ? Set Up Partner Determination.
  Identify the partner function causing the error.
  Check the assigned selection module for that partner function.
  
  
  
  Verify the Selection Module:
  
  Check if the function module assigned exists and is active.
  Review the code of the function module for errors or missing implementations.
  Ensure the function module has the correct interface and parameters as expected by SAP.
  
  
  
  Debug the Function Module:
  
  If possible, debug the function module to see why it fails.
  Check for missing data or incorrect assumptions in the code.
  
  
  
  Check Custom Enhancements/User-Exits:
  
  If the selection module is a custom enhancement, verify that it is correctly implemented.
  Check for recent changes or transports that might have introduced errors.
  
  
  
  Authorization and System Checks:
  
  Ensure the user has the necessary authorizations.
  Check system logs (SM21) and short dumps (ST22) for related errors.
  
  
  
  SAP Notes and Support:
  
  Search for SAP Notes related to VN321 for any known issues or patches.
  If the problem persists, consider raising a message with SAP support.
  
  
  
  
  Related Information:
  
  Partner Functions: Used in SAP to define roles of business partners in documents (e.g., Vendor, Ordering Address, Goods Recipient).
  Selection Module: A function module called during partner determination to influence partner data selection or validation.
  Transaction Codes:
  
  XK01 / XK02 / XK03 - Vendor Master Maintenance
  ME21N - Create Purchase Order
  SPRO - Customizing
  SM37 - Job Monitoring (if batch jobs involved)
  ST22 - Dump Analysis
  SM21 - System Log
  
  
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  VN321 - Error in calling selection module for partner function &
  
  
  Cause
  Missing or faulty selection module assigned to partner function in partner determination
  
  
  Solution
  Check and correct the selection module assignment and implementation
  
  
  Where to Check
  Partner determination customizing, function module code, debugging, authorizations
  
  
  Related Transactions
  XK01, XK02, ME21N, SPRO, ST22, SM21
  
  
  
  
  If you provide the specific partner function code or the context (e.g., transaction or process), I can help you with more targeted advice.