FDM.4:10 - Architectural Rationale

The method joins a governing rule with an actual occurrence because neither alone establishes the particular effect. A generic term describes what would happen; an event description becomes financially meaningful through the applicable conditions.

A transaction log is sufficient when it already supplies adequate evidence for a settled effect rule. A broad business-outcome inquiry is unnecessary for a narrow residual-balance question. The wider inquiry becomes useful when someone claims the financial change itself established the participant’s benefit.