When the Advanced Inventory Management is turned on, and the Reorder Points, Lead Time and Stock Levels were set to auto calculate, the Item Updates happen depending on the preferences set.
Users however may be able to have their Re-order points auto-calculated in real time .
The below address link just need to be copied on the browser's window when logged into NetSuite account.
https://system.netsuite.com/app/common/item/calcstocklevels.nl
Then hit the Submit button, and the Re-order point and Preferred Stock Levels will be auto-calculated.