OTM models order management across three levels: the Purchase Order (what was ordered), the Order Release (a confirmed booking for movement), and Order Movements (the planned legs of that movement). Understanding this hierarchy and the underlying tables is essential for integration work and troubleshooting.

Purchase Order (Order Base):

A Purchase Order represents the commercial transaction — what items are being moved, from where, to where, and under what terms. POs are typically created in an ERP system (e.g. Oracle E-Business Suite) and sent to OTM via inbound integration. Note that POs often lack exact weight and volume details, which are required for shipment planning — those are defined on the Order Release.