How To Fix J4391 - Fields &1 and &2 may not be filled simultaneously

SAP Error Message - Details

• Message type: E = Error

• Message class: J4 - External Data Transfer

• Message number: 391

• Message text: Fields &1 and &2 may not be filled simultaneously

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 J4391 - Fields &1 and &2 may not be filled simultaneously ?

  The SAP error message J4391, which states "Fields &1 and &2 may not be filled simultaneously," typically occurs in the context of data entry or configuration in SAP, particularly in modules related to sales and distribution (SD) or materials management (MM). This error indicates that two fields that are mutually exclusive have been filled at the same time, which is not allowed by the system's validation rules.
  Cause:
  The error arises when both fields specified in the message (represented by &1 and &2) are populated with values at the same time. This situation violates the business logic defined in the SAP system, which expects only one of the fields to be filled. Common scenarios include:
  
  In a sales order, both the "Delivery Date" and "Shipping Point" fields might be filled, which could lead to conflicting information.
  In material master data, both "Base Unit of Measure" and "Alternative Unit of Measure" might be incorrectly filled.
  
  Solution:
  To resolve this error, you need to identify the specific fields mentioned in the error message and ensure that only one of them is filled at any given time. Here are the steps to troubleshoot and fix the issue:
  
  
  Identify the Fields: Check the error message to see which fields are causing the issue. The fields will be indicated in the message as &1 and &2.
  
  
  Review Data Entry: Go back to the transaction or screen where the error occurred and review the data you have entered. Ensure that only one of the conflicting fields is populated.
  
  
  Clear One Field: If both fields are filled, decide which one is necessary for your business process and clear the other field.
  
  
  Consult Documentation: If you are unsure about the purpose of the fields, consult the SAP documentation or your organization's guidelines to understand the correct usage.
  
  
  Test the Changes: After making the necessary adjustments, try to save or process the transaction again to see if the error persists.
  
  
  Seek Help if Needed: If you are unable to resolve the issue, consider reaching out to your SAP support team or a functional consultant who can provide further assistance.
  
  
  Related Information:
  
  Transaction Codes: The error can occur in various transaction codes depending on the context (e.g., VA01 for sales orders, MM01 for material master).
  Configuration Settings: Sometimes, the error may be related to specific configuration settings in the SAP system. If you have access, check the configuration for the relevant module.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional context.
  
  By following these steps, you should be able to resolve the J4391 error and proceed with your SAP transactions.