What it requires. An active decision table's source object holds zero rows.
Why it matters. [doc via snapshot semantics + payload schema] A table compiled from nothing returns no match for every lookup, so every dependent element takes its no-result branch (the step schema's noResultExplainerTemplate is exactly that path) and adjustments silently never apply. Where the empty table is unadopted Salesforce-standard machinery, report as Coverage & Adoption instead - the standard-vs-custom cut decides defect versus signal.
How to fix it. Populate and refresh the source, or retire the table and the elements that read it.
Source. Salesforce Help: Refresh a Decision Table (snapshot semantics)
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