{"ref":"content:a-guide-to-cds-metadata-extensions-fiori-app-generation-and-sap-ui5-controller-e","page":"/content/a-guide-to-cds-metadata-extensions-fiori-app-generation-and-sap-ui5-controller-e","json":"/content/a-guide-to-cds-metadata-extensions-fiori-app-generation-and-sap-ui5-controller-e.json","generated":"2026-10-26","drafted_with_ai":true,"entity":{"id":"a-guide-to-cds-metadata-extensions-fiori-app-generation-and-sap-ui5-controller-e","title":"A Guide to CDS Metadata Extensions, Fiori App Generation and SAP UI5 Controller Extensions","url":"https://community.sap.com/t5/technology-blog-posts-by-sap/a-guide-to-cds-metadata-extensions-fiori-app-generation-and-sap-ui5/ba-p/14449640","content_type":"blog","published_on":"source:sap-community","explains":[{"ref":"capability:fiori-annotations","applies_to":{"ecosystems":["abap","ui5"]}},{"ref":"capability:odata","applies_to":{"ecosystems":["abap"]}}],"summary":"Walks through a RAP-based Fiori elements app end to end: layering [UI annotations](capability:fiori-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](artifact:btp-business-application-studio) from the published [OData](capability: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.","short":"RAP Fiori elements app with metadata and controller extensions","author":"ankitapaul229","published":"2026-07-27","provenance":{"discovered_via":[{"source":"source:sap-community","channel":"abap-rap-tag"}],"first_seen":"2026-10-12"},"drafted_with_ai":true},"readings":{"liveness":[{"label":"Checked against the source","tier":"unknown","evidence":"nobody has checked it"},{"label":"Source reachable","tier":"unknown","evidence":"not crawled"},{"label":"Age","tier":"good","evidence":"published 3 months ago"}],"compatibility":[{"label":"Version","tier":"unknown","evidence":"no version declared"},{"label":"Moved since?","tier":"good","evidence":"no recorded change after 2026-07-27"},{"label":"Findings","tier":"good","evidence":"none flagged"}],"reach":[{"value":1637,"unit":"views"},{"value":0,"unit":"comments"},{"value":4,"unit":"likes"}]},"signals":{"views":1637,"likes":4,"comments":0,"metrics_at":"2026-10-25"},"series":null,"edges":{"authors":[]}}