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## Summary Maps every code path in the API repo that creates an e-conomic draft invoice or sends draft lines, and documents which paths pick a layout, which one they pick, and how the planned **with-discounts / without-discounts** two-layout selection applies. **Key finding:** the two envelope creators already implement a discount-aware selector. No code change is required for the TRU-197 rollout — only the two `invoice*LayoutNumber` config variables need to be set in the `economic` module. ## Findings at a glance - **22** code paths in `services/nginx/app/` create or send draft invoices (2 envelope creators + 6 line-add paths + 14 caller/selector/helper paths) - **2** paths currently pick a layout — both already discount-aware - **0** paths need updating for the 2-layout rollout - **2** config variables drive the selection: `invoiceLayoutNumber` and `invoiceDiscountLayoutNumber` (already wired into `economic::$config` and the OpenAPI schema) ## The two selectors 1. `economic_invoice_draft_mo::resolveLayoutNumber()` at `services/nginx/app/modules/economic/invoices/draft/economic_invoice_draft_mo.php:115` — used by `createInvoiceDraftExample()` for the single-order draft flow. 2. `collected_order_invoices_o::resolveInvoiceLayoutNumber()` at `services/nginx/app/objects/collected_order_invoices_o.php:673` — used by `createInvoiceDraft()` for the collected-invoice flow. Both return `invoice_discount_layout` if any item has a non-zero discount, otherwise `invoice_layout`. They throw if the discount layout is required and `invoiceDiscountLayoutNumber` is unconfigured. ## Document `documentation/economic/layout-selection-flow.md` — full inventory table, current/desired state, and migration plan. ## Related - TRU-197 — `documentation/economic/invoice-template-audit.md` - TRU-193 — `documentation/economic/export-field-audit.md` - PR #391 — `economic_export_sanitizer` Refs: TRU-198 --------- Co-authored-by: openhands <openhands@all-hands.dev> Co-authored-by: OpenClaw <openclaw@copenhagentruckwash.io> Co-authored-by: TRU-198 Subagent <subagent@openhands.dev>