If you run a third-party logistics warehouse, ERPNext gives you solid single-company stock control, but it assumes the inventory in your bins belongs to you. In a 3PL operation the goods belong to your clients, and revenue comes from storing and moving other people's stock, not from selling it. ERPNext core has no concept of a stock owner, no storage rate card, no way to meter pallet-days or pick lines per client, and no billing engine that turns warehouse activity into an invoice. Operators end up tracking client ownership in spreadsheets, reconciling handling charges by hand, and manually raising a Sales Invoice per client every month, which is slow and error-prone once you pass a handful of accounts.

ECOSIRE builds a proper Frappe app that installs alongside ERPNext and adds the 3PL layer natively. We introduce a Stock Owner (client) dimension and enforce it across Stock Entries, Delivery Notes, and Purchase Receipts via hooks.py doc events (validate, on_submit) and server scripts, so every unit in a warehouse is attributable to exactly one client and no cross-client pick can be submitted. New DocTypes such as 3PL Rate Card, Storage Charge, Handling Charge, and VAS Charge model your tariffs — storage by pallet/bin/volume/weight per period, inbound and outbound handling per line or per unit, pick/pack tiers, and ad-hoc value-added services. A scheduler event (scheduler_events in hooks.py) runs on a daily and monthly cadence to snapshot occupancy, accrue storage charges, aggregate handling activity from submitted warehouse documents, and generate a draft periodic ERPNext Sales Invoice per client that your finance team reviews and submits.

On top of the billing engine we build the operational surfaces a 3PL needs: inbound (ASN / receipt) and outbound (order / dispatch) management scoped per client, and a client portal built on Frappe's website and portal framework where each 3PL customer logs in to see only their own stock balances, in-transit orders, and billing history. Access is locked down with dedicated Role Profiles and permission rules plus User Permissions on the client link field, so a portal user can never query another client's inventory. Integrations use the standard Frappe REST API and purpose-built @frappe.whitelist() methods, so your clients' own systems (or a WMS/shipping tool) can push orders and pull stock and invoice data programmatically. Client Scripts add the in-form UX — owner filters, live charge previews, and validation — without forking ERPNext.

Because this is build-to-order, nothing ships as an instant download. We start with a short scoping call to map your rate structure, warehouse layout, and billing cycle, then build against your exact requirements on Frappe/ERPNext v15 or v16. Typical delivery is one working week from confirmed scope. You get the installable source, UAT on a staging bench with a rollback plan, install and configuration on your environment, documentation and a training session, and a post-go-live support window. No fabricated benchmarks, no boilerplate — a working 3PL billing system tailored to how your warehouse actually charges.