How To Fix UCS0304 - User name &1 is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 304

• Message text: User name &1 is invalid

What causes this issue?

The transferred user name does not exist.

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?

Enter a valid user name.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCS0304 - User name &1 is invalid ?

  The SAP error message UCS0304, which states "User name &1 is invalid," typically occurs when there is an issue with the user ID being used in the SAP system. Here are the potential causes, solutions, and related information for this error:
  Causes:
  
  Invalid User ID Format: The user ID may not conform to the naming conventions set by the SAP system (e.g., length, special characters).
  User Does Not Exist: The specified user ID may not exist in the SAP user master records.
  User Locked or Inactive: The user account may be locked or inactive, preventing login.
  Authorization Issues: The user may not have the necessary authorizations to perform the action they are attempting.
  System Configuration: There may be configuration issues in the system that affect user management.
  
  Solutions:
  
  Check User ID Format: Ensure that the user ID follows the correct format as per your organization's naming conventions. Typically, SAP user IDs should be alphanumeric and may have specific