Allocated at finalization; null on drafts (drafts never consume numbers)

Leistungs-/Lieferdatum (§ 14 Abs. 4 Nr. 6 UStG); period start when deliveryDateEnd is set

Leistungszeitraum end: set → the document covers a service period (BT-73/BT-74) instead of a single date

Language this document is written in, chosen when the draft is created and frozen with the rest of the snapshot at finalization.

Stored per document, not read from settings at render time: re-rendering a finalized invoice must reproduce the PDF the buyer received, and a seller switching their default must not reword documents already sent. null means the document predates document languages, so it renders in German, the only language the module used to speak.

Betreff shown on the document and as email subject

Kopf-Text: free text above the line items (sevDesk pattern)

Fuss-Text: free text below the totals

Free-text document note (also carries the § 19 wording when applicable)

Lieferbedingungen shown on the PDF

Gesamtrabatt: document-level percent discount, compounded onto every line at totals/snapshot time

Interne Kontaktperson: company user shown as seller contact (PDF + XML)

Skonto: early-payment discount in percent (null = no Skonto offered)

Skonto: days from issue date within which the discount applies

Offers only: deposit (Anzahlung) in percent of the gross total. When the buyer accepts the shared offer, a finalized deposit invoice over this share is created automatically (null = no deposit asked).

Whether this invoice may be paid through the connected providers (invoicePayableOnline): the pay button in mails and reminders AND the methods the pay page offers, so a stale link cannot pay what the mail did not offer. The page link itself stays valid: it is the invoice view (PDF, bank details), which WhatsApp delivery and "copy link" hand out. Off for invoices born from a manual-payment booking whose meeting type asked for it; operational state, so it may change after issue.

When the outstanding amount reached zero

Excluded from dunning auto-send (manual sends stay possible)

CRM contact this document belongs to (buyer jsonb stays authoritative)

CRM company the buyer was taken from.

The buyer jsonb stays authoritative — an issued document must not change because someone later edited the company record. This only records where the address came from, so the editor can offer to pull it again and so a company's documents can be found.

Which of the seller's bank accounts to print. Null falls back to the single account on invoicing settings, which is what every existing document does.

Chain reference: offer→invoice conversion, Storno→original

Soft delete is permitted for DRAFTS ONLY (service-enforced)