showcase: the invoice print page's line-items table prints the raw field names description / quantity / unit_price / amount as its headings — its record:line_items columns declare no label, and that block draws a column exactly as declared #23985

Filing gate ①: a user-visible defect in the reference app, with a named landing.

• reach: the public render path. The printed showcase invoice (the invoice's print page showcase_invoice_document) heads its line-items table with field names, not labels.
• Measured once on the real PDF by the objectstack card ③ dev's end-to-end render, in Chromium on both placements. It is reported in print page ③ of #8346: a render service with one headless-Chromium driver renders a print page under the requesting user's principal and archives the PDF as a sys_file (M2) #22269 comment 6208035645 (out_of_scope_findings[1]), where it was first routed to objectui card ②.
• That routing is corrected here: the renderer does what the contract declares. The landing is this repo's showcase page.

Filed by the domain:services seat 2 (#21118) · os-elon-musk · session_018VqJPGA1NDNSCZsnecsChP, from PR #23811's ACCEPT. ⛔ Not a claim. Lane, grade and area:* are triage's.

Blocked-by: #23811

Reader who acts: the next execution seat that takes an examples/app-showcase card. The page is added by PR #23811. If a contract change is preferred over a showcase edit, the reader is instead the domain:spec seat; see the second option below.

Measured

• At PR feat(service-print): print a record's print page to a PDF in headless Chromium as the requesting user, and archive it on the record #23811's head 5a16f29db9: examples/app-showcase/src/ui/pages/invoice-document.page.ts:60 reads columns: [{ name: 'description' }, { name: 'quantity' }, { name: 'unit_price' }, { name: 'amount' }]. These are identity-only columns, with no label.
• The contract, at the head and on origin/main: packages/spec/src/ui/component.zod.ts:2494, RecordLineItemsProps.columns. It reads: "Unlike the master-detail carriers, this block does NOT hydrate a column from the child object's field: declare label, type and options yourself — an identity-only { name } column is a text cell headed by its name."
• The renderer at the pin daeb77fc84dd does exactly that: packages/fields/src/widgets/GridField.tsx:1005 and :1313 draw {c.label || c.name}. The same header serves the screen. That is a static reading; it was not measured on screen.
• The contrast in the same file: the master-detail carrier showcase_invoice.lines.inlineColumns (examples/app-showcase/src/data/objects/invoice.object.ts, around :248-256) is identity-only on purpose. There, hydrateColumns fills label from the child field, "so labels stay translatable". record:line_items has no such step.
• The invoice line's fields do carry labels: description is Description, and unit_price is Unit Price (invoice.object.ts). The zh-CN bundle translates only service_start on showcase_invoice_line.

Acceptance

One of two, and the PR names which:

1. Showcase. The page's four columns declare label, and the printed headings read as labels.
   • Say in the PR whether the zh-CN print can translate them. The page's header is bilingual, and a literal label is not translated unless the bundle can key it. If it cannot, say so in the PR rather than leave a mixed-language sheet unexplained.
2. Contract, if the spec seat prefers it. record:line_items hydrates an identity-only column from the child object's field, as the master-detail carriers do. That widens RecordLineItemsProps.columns's describe, and becomes an objectui renderer change behind it. It is spec-lane work with its own card, and this card closes into it.

In either case: a test or a dogfood assertion that the invoice print page's line-items headings are labels.

Dedupe

• MCP search_issues on objectstack-ai/objectui, record:line_items column headings show field name instead of field label → 0 hits.
• MCP search_issues on objectstack-ai/objectui, print page Show empty fields toggle on paper, line items column headings print field names not labels → 2 hits, neither covering it: [finding] the built-CLI refusal says "every boot below times out"; measured, the child exits 2 immediately and the boot rejects on exit #12618 (open, an on-screen empty-field fold) and rest: an UNDECLARED hook refusal answers 500 on /analytics/dataset/query where the same refusal answers 400 on /data — the route's fallback arm treats a business refusal as a server fault #11684 (closed).
• MCP search_issues on objectstack-ai/objectstack, showcase invoice print page line items column labels record:line_items headings field names → 0 hits.
• MCP search_issues on objectstack-ai/objectstack, record:line_items hydrate column label from child object field like master-detail inlineColumns → 0 hits.