How To Fix CRM_EXT_REF402 - Additional external reference type &1 is not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: CRM_EXT_REF - Messages for Add. External References Set

• Message number: 402

• Message text: Additional external reference type &1 is not defined

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 CRM_EXT_REF402 - Additional external reference type &1 is not defined ?

  The SAP error message "CRM_EXT_REF402: Additional external reference type &1 is not defined" typically occurs in the context of SAP Customer Relationship Management (CRM) when the system encounters an external reference type that has not been properly defined in the system configuration.
  
  Cause:
  
  
  Undefined External Reference Type: The error indicates that the external reference type specified (represented by &1 in the message) is not recognized by the system. This could be due to:
  
  The reference type not being created in the system.
  A typo or incorrect reference type being used in the transaction or configuration.
  Missing configuration in the relevant customizing settings.
  
  
  
  
  Configuration Issues: The external reference types are usually defined in the customizing settings of SAP. If the necessary configuration has not been completed, the system will not recognize the reference type.
  
  
  
  Solution:
  
  
  Check Configuration:
  
  Go to the SAP Customizing Implementation Guide (IMG) and navigate to the relevant section for defining external reference types. This is typically found