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A Guide to CDS Metadata Extensions, Fiori App Generation and SAP UI5 Controller Extensions

Walks through a RAP-based Fiori elements app end to end: layering UI annotations onto a CDS view through a separate ABAP metadata extension object, gated by @Metadata.allowExtensions on the base view and ordered across extensions by a required @Metadata.layer value. Generates the app in SAP Business Application Studio from the published OData V4 service's merged $metadata document, then adds an SAP UI5 controller extension — registered in manifest.json against a Fiori elements lifecycle hook — only for behaviour the annotations cannot express.

Where it sits

Explains
Fiori annotationsUI5ABAPFiori annotationscapabilityDescribing a service so a Fiori client can render it without hand-written UI code — titles, value helps, hierarchies and visibility expressed as model annotations rather than screen logic.ODataABAPODatacapabilityExposing data and operations through OData, including the service model, metadata and protocol versions clients require. Version differences affect which clients can consume a service and which query features they can use.
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ankitapaul229author

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For fiori-annotations

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Applies in
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abapui5

For odata

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Applies in
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abap

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Details

Graph4 edges
POINTS OUT →
explainsFiori annotationscapability, core and community
explainsODatacapability, core and community
published onSAP Communitypublishing source
discovered viaSAP Communityabap-rap-tag
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  • Entered the atlasDiscovered via SAP Community · abap-rap-tag.
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