How To Fix /IWBEP/CM_V4_COS021 - Filter expression could not be mapped into ABAP select options

/IWBEP/CM_V4_COS021 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_COS -

• Message number: 021

• Message text: Filter expression could not be mapped into ABAP select options

Self-Explanatory Message

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/IWBEP/CM_V4_COS021 - Details

• The SAP error message /IWBEP/CM_V4_COS021 indicates that there is an issue with the filter expression in an OData service that cannot be mapped to ABAP select options. This typically occurs when the filter criteria specified in an OData query cannot be translated into a valid SQL query for the underlying database.
  Causes:
  
  Unsupported Filter Expressions: The filter expression used in the OData request may contain operators or functions that are not supported by the ABAP backend.
  Data Type Mismatch: The data types of the fields being filtered may not match the expected types in the ABAP layer.
  Complex Filters: The filter expression may be too complex or involve multiple conditions that cannot be directly translated into ABAP select options.
  Missing Annotations: The OData service may lack the necessary annotations that define how certain fields should be handled in filtering.
  Incorrect Field Names: The field names used in the filter expression may not match the names defined