"Do we have it?" has four answers depending on when, where and whether it is made from something else. The item card has all four.
On an item (or a sales line), Item Availability by: Event shows every scheduled receipt and shipment in date order with the running projected balance, so you see the day it goes negative; Period summarises by day, week or month; Location by warehouse; BOM Level shows how many you could assemble from components on hand; Variant by variant; Unit of Measure.
On a sales line, the Sales Line Details FactBox shows availability for the line's item and location without opening anything. For a promised date, use the Order Promising action, which calculates the earliest shipment date from availability and lead times.
