For each extracted line Sprwt first looks for an ingredient whose supplier item ID (SKU) matches the number on the receipt for that supplier. If there is none it compares names: an exact name match, or a name at least 75% similar, is treated as the same ingredient and appears under Existing Items; everything else goes to New Items. For new items the unit on the receipt (lb, oz, gallon, dozen, case …) is matched to your Units list – and if no unit exists it is created automatically. Existing-item cards flag a Receipt Mismatch Found when the receipt's base weight, unit, price or supplier differs from what is stored, with a Convert, Recalculate Macros, and Update Stock shortcut. You can also click the pencil icon on a card to swap it to a different ingredient.