How To Fix /IWBEP/CM_V4_COS204 - Expand expression not matching expand tree list

/IWBEP/CM_V4_COS204 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_COS -

• Message number: 204

• Message text: Expand expression not matching expand tree list

Self-Explanatory Message

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/IWBEP/CM_V4_COS204 - Details

• The SAP error message /IWBEP/CM_V4_COS204 Expand expression not matching expand tree list typically occurs in the context of OData services when there is a mismatch between the requested expand expressions in the OData query and the defined expand structure in the service metadata.
  
  Cause:
  
  Mismatch in Expand Expressions: The error usually arises when the client requests to expand a navigation property that is not defined in the service's metadata or is not part of the expand tree structure.
  Incorrect OData Query: The OData query might be incorrectly formed, requesting properties or relationships that do not exist or are not accessible.
  Service Metadata Changes: If there have been changes to the service metadata (like adding or removing navigation properties) without updating the client-side queries, this can lead to such errors.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to access certain properties or relationships, leading to a mismatch.
  
  
  Solution:
  
  Check the OData Query: Review the