Generating applications using the templates wizard in VSCode

A system connection to onPremise ABAP system may not be established, caused by self-signed certificate of backend System/OData service. This is the case with developer edition of ABAP Systems, or connecting sandbox systems.

Try to export/import certificate (with Base64 Encoding) as first solution for a single system, and restart windows:

https://help.sap.com/viewer/17d50220bcd848aa854c9c182d65b699/LATEST/en-US/4b318bede7eb4021a8be385c46c74045.html

If you need to ignore such validation for all backend systems:

npm config set strict-ssl=false

Source: https://stackoverflow.com/questions/45088006/nodejs-error-self-signed-certificate-in-certificate-chain

Running your application

This issue may come up again in VSCode / browser console in this format, and application is broken, due no data can be fetched from backend system / OData, caused by certificate issue

For that change the ignoreCertError parameter to true in ui5.yaml of your project

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