3053116 - Approve PR fiori APP - extension app

Trying to extend FIORI standard app with an extension project fails with errors similar to the following:

jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not found: http://localhost:8080/file/hContent/MM_PR_APVExtension/appconfig/fioriSandboxConfig.json)
send @ jquery-dbg.js:9203
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not found: http://localhost:8080/file/hContent/MM_PR_APVExtension/sap-ui-cachebuster-info.json)
send @ jquery-dbg.js:9203
jquery.sap.global-dbg.js:999 2021-04-16 01:07:57.133375 Failed to load AppCacheBuster index file from: "http://localhost:54440/sap-ui-cachebuster-info.json?sap-ui-language=en-US". -  
K @ jquery.sap.global-dbg.js:999
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not Found)
send @ jquery-dbg.js:9203
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not Found)
send @ jquery-dbg.js:9203
jquery.sap.global-dbg.js:999 2021-04-16 01:07:58.592645 No component handle available for 'ui.s2p.mm.requisition.approve.MM_PR_APVExtension'; fallback to component.load() -  sap.ushell.components.container.ApplicationContainer
K @ jquery.sap.global-dbg.js:999
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not Found)
send @ jquery-dbg.js:9203
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not Found)
send @ jquery-dbg.js:9203
:54440/favicon.ico:1 Failed to load resource: the server responded with a status of 404 (Not found: http://localhost:8080/file/hContent/MM_PR_APVExtension/favicon.ico)
jquery-dbg.js:9203 Failed to load resource: the server responded with a status of 404 (Not Found)
send @ jquery-dbg.js:9203
crossroads-dbg.js:678 Uncaught Error: The segment {SAP__Origin} is required.
    at B (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:3224:7494)
    at String.replace (<anonymous>)
    at Object.y [as interpolate] (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:3224:7658)
    at R.interpolate (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:3224:4999)
    at constructor.getURL (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:1009:44)
    at constructor.getURL (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:1027:156)
    at constructor.navTo (eval at evalModuleStr (jquery.sap.global-dbg.js:3315), <anonymous>:1033:34)
    at f.navToItemDetails (S3_header.controller.js?eval:4)
    at f.a.fireEvent (EventProvider-dbg.js:229)
    at f.a.fireEvent (Element-dbg.js:593)

SAP Web IDE Personal Edition

KBA , CA-UI5-FL-ADP-WDE , SAPUI5 Adaptation Project for SAP Web IDE Fullstack , Problem