Message type: E = Error
Message class:  SADL_GW_ATC_CONSMPTN - SADL Gateway: ATC Messages for Consumtion Annotations 
Message number: 818
Message text: @Consumption.ranking.activeFunctions missing, ranking not effective
There are annotations @Consumption.ranking.parameterBinding - maybe
inherited from lower CDS-views -, but there is no
@Consumption.rankingActiveFunctions-annotation.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Either you add the missing @Consumption.ranking.activeFunctions, or you
remove the @Consumption.ranking.parameterBinding on element-level. If
the latter has been inherited, you can set it NULL.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message SADL_GW_ATC_CONSMPTN818 typically indicates an issue related to the consumption of Active Functions in the SAP Gateway framework, particularly when using the SAP ABAP Programming Model for SAP Fiori or OData services. This error suggests that the ranking of active functions is not effective due to a missing configuration or setup.
Cause: Missing Active Functions: The error may occur if there are no active functions defined in the system that can be used for the specific OData service or consumption scenario.
Configuration Issues: There might be a misconfiguration in the service definition or the associated annotations that define how the active functions should be ranked and consumed. Transport Issues: If the system has recently undergone a transport of changes, it is possible that the active functions were not properly transported or activated in the target system. Authorization Issues: Sometimes, the user might not have the necessary authorizations to access the active functions,
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SADL_GW_ATC_CONSMPTN817 functionId &1: binding incomplete, parameterId &2 missing
What causes this issue?  The definition of ranking function &V1& defines a parameter &V2& which is not bound to an element.System Resp...
SADL_GW_ATC_CONSMPTN816 functionId &1: parameterId &2 cannot be mapped (constraint) (&3)
What causes this issue?  At element &V3&, a binding for parameter &V2& of ranking function &V1& is defined. This parameter doe...
SADL_GW_ATC_CONSMPTN819 functionId must be specified (&1)
What causes this issue?  At element &V1&, there is a @Consumption.ranking.parameterBinding-annotation which lacks the functionId-tag.System Re...
SADL_GW_ATC_CONSMPTN820 Type STRING cannot be used with ranking functions (&1)
What causes this issue?  Element &V1& is of type STRING. This type cannot be used with ranking functions.System Response  The system issues an...
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