Strictly forward: Bid → PO → Submittal → Fab → Shipped → On-site → Installed. Going back (e.g. Shipped → Fab for re-fab) creates a stage_revert event and flags risk.
Float days = forecast delivery − ROJ. Negative float surfaces in red. Recomputed nightly + on every stage change. Feeds Schedule Risk.
New PO opens the PO Generator. Issue PO sends it. Expedite drafts a vendor email pre-filled with the ROJ. Substitute opens the Substitution Recommender.
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