Message type: E = Error
Message class:  SADL_GW_ATC_CONSMPTN - SADL Gateway: ATC Messages for Consumtion Annotations 
Message number: 800
Message text: Unknown annotation '&1'
Annotation &V1& is not defined in domain @Consumption.ranking.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Check for typographical errors. Correct or remove the annotation.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message SADL_GW_ATC_CONSMPTN800 Unknown annotation '&1' typically occurs in the context of SAP Gateway and the SAP Application Development Framework (SADL). This error indicates that there is an unknown or unrecognized annotation being referenced in your OData service or in the annotations of your CDS (Core Data Services) view.
Cause: Typographical Error: The annotation name might be misspelled or incorrectly formatted. Unsupported Annotation: The annotation being used may not be supported in the current version of SAP or in the context where it is being used. Missing Dependencies: The required libraries or dependencies that define the annotation may not be included in your project or are not activated. Incorrect Context: The annotation might be used in a context where it is not applicable or expected.
Solution: Check Annotation Spelling: Verify that the annotation name is spelled correctly and follows the correct syntax. Review Documentation: Consult the SAP documentation for the specific version you are using to
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