Purchase: buying documents in 4 pages
Last updated 2026-10-14
Purchase handles buying documents: create the PO, announce the arrival with an ASN, and watch WMS write the received quantities back.
Purchase is where you manage the "buying" paperwork: place an order with a supplier (PO), give the warehouse a heads-up that goods are coming (ASN), and then watch receiving results flow back from WMS. It is the buyer side of the business — selling is in OMS, storing is in WMS.
The 4 pages in this section#
- Purchase orders — build a PO by hand (vendor, warehouse, line items), submit it for approval, and approve or reject it. The PO is the start of everything.
- purchase-asn (ASN) — from an approved PO, build an advance shipping notice, send it, and let it create or link the WMS inbound receipt. Or release the PO straight to WMS without an ASN.
- purchase-receiving — receiving itself happens in WMS; this page shows the quantities WMS writes back (received_qty per line) and the variances (ordered − received).
- purchase-replenishment — daily computed buy suggestions: suggested qty = daily sales × (lead time + safety days) − on hand − in transit. One click drafts a PO from a suggestion; dismiss the ones you do not want.
A PO number looks like PO-000001 and an ASN number looks like ASN-20261014-0001. If you only remember one thing: nothing in Purchase is automatic from sales — every PO starts from a person typing it in.
Upstream and downstream#
- WMS — the inbound receipt created by an ASN send or a PO release is where receiving, putaway, and counting actually happen.
- Vendors — the supplier list is shared master data (shared_vendors) with WMS; one vendor record serves both sides.
- Accounting — the bills you owe these vendors live in Accounting (AP bills, BILL-).
