SAP S/4HANA Migration · Brownfield: Executing System Conversion

Beyond the rough 'prepare in uptime, convert in downtime' picture, what are the named SUM phases a conversion moves through, and which two run before any shadow system exists?

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More in Brownfield: Executing System Conversion

For adapting custom code to S/4HANA, why should you work in ADT (Eclipse) rather than the classic ABAP Workbench, and why only after the dev system is converted?

You need to prove a piece of custom ABAP is S/4HANA-ready before conversion. In ADT, which ATC check variant surfaces the incompatibilities, and what kind of change does clearing them typically require?

Beyond flagging problems, how does ATC in ADT speed up repetitive S/4HANA code adaptations across an entire package?

Once your custom code passes ATC syntactically, what further optimization does the move to HANA invite, and which tool shows you where to focus?

The SAP Fiori launchpad is the user's sole central entry to S/4HANA, so why does S/4HANA still need a separate frontend server, and what is that server technically?

You don't want to activate every Fiori app at once. What tells you which apps are actually worth migrating first, and what data drives it?

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