How To Fix /IWBEP/SBUIOD021 - Type '&1' is not a data structure

/IWBEP/SBUIOD021 - Overview

• Message type: E = Error

• Message class: /IWBEP/SBUIOD -

• Message number: 021

• Message text: Type '&1' is not a data structure

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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/IWBEP/SBUIOD021 - Details

• The SAP error message /IWBEP/SBUIOD021 Type '&1' is not a data structure typically occurs in the context of SAP Gateway and OData services. This error indicates that the system is expecting a data structure (like a complex type) but is encountering a type that is not recognized as such.
  
  Cause:
  
  Incorrect Type Definition: The type specified in the OData service is not defined as a data structure in the ABAP Dictionary. This could happen if the type is a primitive type (like string, integer, etc.) or if it is not defined at all.
  Service Metadata Issues: The OData service metadata might not be correctly defined or might be missing the necessary data structure definitions.
  Model Configuration: There could be issues with the way the OData model is configured, leading to the system not recognizing the type as a valid data structure.
  Versioning Issues: If there are multiple versions of the OData service, the wrong version