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