How To Fix SAML2126 - Can not cast object of type &1 to type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 126

• Message text: Can not cast object of type &1 to type &2

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2126 - Can not cast object of type &1 to type &2 ?

  The SAP error message SAML2126 indicates that there is a type casting issue in the context of SAP's Security Assertion Markup Language (SAML) processing. Specifically, the error message states: "Can not cast object of type &1 to type &2," where &1 and &2 represent the source and target types, respectively.
  Cause:
  This error typically occurs when there is an attempt to convert or cast an object from one type to another, but the object is not compatible with the target type. This can happen in various scenarios, such as:
  
  Configuration Issues: Incorrect configuration in the SAML settings, where the expected type does not match the actual type being processed.
  Data Type Mismatch: The data being processed does not conform to the expected structure or type, leading to a failure in casting.
  Code Issues: If there is custom code or enhancements that manipulate SAML assertions or responses, there may be a bug or oversight in the type handling.
  
  Solution:
  To resolve the SAML2126 error, consider the following steps:
  
  
  Check Configuration:
  
  Review the SAML configuration settings in your SAP system. Ensure that the expected types for SAML assertions and responses are correctly defined.
  Verify that the Identity Provider (IdP) and Service Provider (SP) configurations are aligned and compatible.
  
  
  
  Review Logs:
  
  Check the SAP application logs (transaction SLG1) for more detailed error messages or stack traces that can provide insights into where the casting issue is occurring.
  Look for any additional context around the error that might indicate which specific object is causing the issue.
  
  
  
  Debugging:
  
  If you have access to the ABAP code, consider debugging the relevant sections where the casting is taking place. Identify the objects involved and their types to understand why the casting is failing.
  Ensure that the objects being processed are of the expected types before attempting to cast them.
  
  
  
  Consult Documentation:
  
  Review SAP documentation related to SAML and the specific components you are using. There may be known issues or additional configuration steps required.
  
  
  
  Update SAP System:
  
  If the issue persists, check for any available SAP Notes or patches that address this specific error. Sometimes, bugs are fixed in later releases or patches.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP Support for assistance. Provide them with detailed information about the error, including logs and configuration settings.
  
  
  
  Related Information:
  
  SAML: SAML is an XML-based framework for exchanging authentication and authorization data between parties, particularly between an IdP and an SP.
  SAP Security: Understanding SAP's security model and how SAML integrates with it can help in troubleshooting issues related to authentication and authorization.
  ABAP Development: Familiarity with ABAP programming and debugging techniques can be beneficial when dealing with custom code that interacts with SAML.
  
  By following these steps, you should be able to identify and resolve the underlying cause of the SAML2126 error in your SAP environment.