Long quotations, multi-page purchase orders and pick lists are hard to talk about when nobody can point to a line by number. Sales reps say "the third item from the bottom," warehouse staff annotate a printout by hand, and approvers reference rows by product name in email threads. Odoo core does render order lines in a defined order and lets you drag to re-sequence them, but it exposes no visible, monotonic line number on sale.order.line, purchase.order.line or stock.move — and none of the standard QWeb documents (the sale quotation, the purchase order, the delivery slip) print one. As soon as a document runs past a page, or a section/note line breaks the flow, the lack of a stable reference number becomes a real friction point in day-to-day operations.

We build a focused module that adds a computed line-number field to the line models you choose and surfaces it everywhere it matters. Technically, this is a models.Model extension that adds an integer/char x_line_number field computed with an ordered pass over order_id.order_line (an @api.depends('order_id.order_line', 'sequence') compute that walks the recordset in sequence order and assigns 1..N). We can honor Odoo's section and note line types the way you want — either numbering only real product lines, or restarting numbering per section (e.g. 1.1, 1.2 under section 1), whichever matches how your team reads the document. The number renders in the order-line tree/list view via an inherited XML/OWL view, and — most importantly — is injected into the relevant QWeb report templates (sale.report_saleorder_document, purchase.report_purchaseorder_document, stock.report_delivery_document) as a left-most column so printed and emailed PDFs carry it too. Security stays clean: the field is read-only and computed, so no new ir.model.access.csv write rights or record rules are required beyond what the base documents already enforce.

Because these are computed, store-optional fields, the numbers stay correct as lines are added, removed or re-dragged, and they can be exposed to the XML-RPC/JSON-RPC API and to any downstream integration or custom report you already run. The module is packaged with a proper __manifest__.py, is Community-compatible (no Enterprise dependency for the core numbering behavior), and is built and tested against the Odoo version you run.

This is a build-to-order engagement, not an instant download. After a short scoping call we confirm exactly which documents get numbered, how sections and notes are handled, and whether the number should also flow into invoices, backorders or your custom reports. We then build against your target version (17.0, 18.0 or 19.0), deliver on a staging database for UAT, and go live with a rollback plan. Typical delivery is 2–4 weeks from confirmed scope. Pricing starts from $249 (indicative, single-company base scope); numbering additional document types, per-section numbering schemes, custom report layouts and multi-company rollout increase the quoted scope.