How To Fix /IWBEP/CM_CP167 - Instance of a complex type could not be serialized

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_CP -

• Message number: 167

• Message text: Instance of a complex type could not be serialized

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 /IWBEP/CM_CP167 - Instance of a complex type could not be serialized ?

  The SAP error message /IWBEP/CM_CP167 Instance of a complex type could not be serialized typically occurs in the context of SAP Gateway services when there is an issue with serializing complex data types into the expected format (usually JSON or XML) for OData services. This can happen for various reasons, including issues with the data structure, missing fields, or incorrect data types.
  Causes:
  
  Data Structure Issues: The complex type may not be properly defined in the data model, or there may be inconsistencies in the data structure.
  Null or Missing Values: If the complex type contains fields that are null or missing, it may lead to serialization issues.
  Unsupported Data Types: Certain data types may not be supported for serialization, leading to this error.
  Circular References: If there are circular references in the data model, it can cause serialization to fail.
  Incorrect Annotations: Annotations in the OData service definition may not be correctly set, leading to