If you sell on marketplaces or D2C channels and fulfill through dropship suppliers, ERPNext gets you most of the way: it already models Supplier, Purchase Order, Delivery Note, and even has a "Drop Ship" flag that lets a Sales Order line spawn a supplier PO. Where native runs out of road is the automation and reconciliation around it. Out of the box you still manually decide which supplier fills each line, manually create the PO, manually reconcile the vendor's shipment confirmation, and manually copy tracking numbers into a notification. There is no vendor stock-feed ingestion, no per-line landed-cost/margin visibility at the moment of routing, and no closed loop that moves a customer from "confirmed" to "shipped with tracking" without a human touching three DocTypes.

ECOSIRE builds this as a proper Frappe app (its own module, installed via bench get-app / bench install-app) rather than a pile of loose customizations, so it upgrades cleanly and hands over as a git repository. We add a Dropship Supplier configuration DocType (lead time, cost basis, feed URL/credentials, preferred-vendor rules) and a Vendor Fulfillment DocType that tracks each dropship line from routing through shipment. Sales Order routing is driven by hooks.py doc events — an on_submit/validate handler evaluates your routing rules (by item, warehouse, supplier stock, or cost) and either auto-creates the supplier Purchase Order or queues it for review. Server scripts and whitelisted Python methods (@frappe.whitelist()) expose the actions your ops team and suppliers need, and client scripts surface a clean routing panel on the Sales Order form. All of it respects ERPNext's permission model via dedicated role profiles so a supplier-portal user sees only their own fulfillment records.

The vendor stock feed sync runs on Frappe's scheduler. A scheduled event (hourly/daily, configurable) pulls each supplier's CSV export or REST endpoint, upserts an availability table, and flags items where a dropship route would fail before the order is even placed — so you stop promising stock a vendor doesn't have. When a supplier confirms a shipment (via the Frappe REST API, a supplier-portal form, or a webhook you nominate), the app writes the Delivery Note, stamps the tracking number and carrier, and relays it to the customer through ERPNext's own notification/email framework. Landed cost and margin are computed per dropship line so you see true contribution, not just headline price, at the point of fulfillment.

Because this is build-to-order, nothing is a generic download. We start from your actual channels, supplier list, feed formats, and routing logic, agree a written scope, then build against Frappe/ERPNext v15 or v16 to match your site. You receive the installable app source, a UAT pass on a staging bench with a rollback plan, install and configuration on your instance, documentation, a user-guide plus training session, and a post-go-live support window. Typical delivery is 2–4 weeks from confirmed scope, depending on how many supplier feed formats and routing rules are in play.