Where NAV really breaks
Most NAV incidents trace to three inputs: stale or unvalidated prices, mishandled corporate actions, and trades captured after the cut-off. Fixing NAV means fixing feeds and cut-offs, not replacing the accounting platform.
The three usual suspects
Pricing. A single stale or unchallenged vendor price on an illiquid line moves the strike. Tolerance checks and a documented fair-value process matter more than the pricing vendor's brand.
Corporate actions. Voluntary events with elections are where automation stops and email starts. Every missed election is a NAV restatement candidate.
Late trades. Anything captured after the cut-off is either an adjustment or a break. Cut-off discipline is an operating-model problem, not a software one.
The consultant's move
Start with an incident log, not an architecture diagram. Classify the last twelve months of NAV issues into those three buckets and the roadmap writes itself.