The planner builds a shortage report every Monday morning from ERP exports, a supplier-confirmations spreadsheet, and the production-schedule pivot table that lives on someone's desktop. By the time it's circulated, half the data is already stale, and the half that matters is the line that's about to stop on Wednesday.
Suppliers send ETAs that drift. Customs holds containers without telling anyone. Your line-side inventory drops below MOQ and nobody notices until the supervisor walks the dock. Each one is a small miss; together they cost you the shift you needed for the OEM call-off this week.
The data exists, scattered across ERP, supplier portals, and freight forwarder emails. What's missing is anyone who can read all of it in the same minute and act on it before the planner's next report.