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501_BadRequest_MethodNotImplemented

 The following message Status code received: 501 Not Implemented Response body: {"error":{"code":"BadRequest_MethodNotImplemented","message":"The OData filter expression is not supported. CorrelationId: 35e16c80-fa86-41a1-a0fc-c91c510276ab."}} indicates that the request made to the OData service was not successfully processed because the filter expression used in the query is not supported. 

Possible Causes:

  1. Unsupported Filter Operator – Some complex filters (like startswith(), endswith(), or nested conditions) may not be allowed.
  2. Query Not Allowed on That Endpoint – The API might not support filtering on the field you specified.
  3. OData Version Compatibility Issue – The API might be expecting a different OData version where certain filters are restricted.
Possible Solutions:

  1. Check the API documentation to see which filter expressions are supported.
  2. Simplify or modify the filter expression to a more basic format.