> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstresonance.io/llms.txt
> Use this file to discover all available pages before exploring further.

# PurchaseOrderLineInventory

> Join record linking a PO line inventory to its per-serial run step. Each entry pairs a specific serialized part inventory with its outside service processing run step (if assigned), enabling per-serial traceability when multiple units share a single PO line.