| Part | Catalog identity, compatible assets, types, documents, and cost | None by itself |
| Location stock | On-hand quantity, minimum, maximum, and area | Current stock at one location |
| Work-order part | Planned demand and issue stage | Committed at Reserved, Kitted, or Staged; physical deduction at Issued |
| Vendor | Supplier, contacts, and part-specific terms | None by itself |
| Purchase order line | Ordered part or one-off item | Counts as outstanding supply while the order is active |
| Receipt | Shipment allocation to a location | Adds part-backed quantities to stock |