How To Fix CL_SADL_GW_MDE_MSGX009 - Filter sign & is unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: CL_SADL_GW_MDE_MSGX - texts for parser

• Message number: 009

• Message text: Filter sign & is unknown

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 CL_SADL_GW_MDE_MSGX009 - Filter sign & is unknown ?

  The SAP error message CL_SADL_GW_MDE_MSGX009 with the description "Filter sign & is unknown" typically occurs in the context of using the SAP Gateway and the SADL (SAP ABAP Programming Model for SAP Fiori) framework. This error indicates that there is an issue with the filter criteria being used in a query, specifically that the filter sign (e.g., '=', '<>', '>', '<', etc.) is not recognized or is invalid.
  
  Cause:
  
  Invalid Filter Sign: The filter sign used in the query is not one of the expected values. This can happen if the filter is constructed incorrectly in the code or if the input parameters are not validated properly.
  Data Type Mismatch: The filter sign may be valid, but it is being applied to a field that does not support that operation due to a data type mismatch.
  
  Configuration Issues: There may be issues with the configuration of the OData service or the underlying data model