Generate corrective invoice

Returns 201 with the new invoice: is_corrective: true, corrective pointing at the original, and a number derived from the original's in the same series (F-2026-0042-REC1, -REC2… for successive correctives).

Flow: the original must already be issued (sent or paid) → the corrective is born already issued, never as a draft → when VeriFactu is enabled its alta is transmitted to AEAT asynchronously, so a 201 does not mean AEAT has accepted it yet.

The original is never modified: it keeps its number, its status and its own VeriFactu record.

A corrective is an additional document, not an edit.

Full vs partial. correction_type: full is a substitution (VeriFactu nature S): the lines you send are the final correct amounts, and omitting lines entirely turns it into a full cancellation, where every original line is copied back negated and prefixed [ANULACION].

correction_type: partial is a correction by differences (nature I): lines is required and each one is a delta — typically negative — prefixed [AJUSTE].

In a partial correction a line only moves stock if it declares its own product_id; in a substitution the product is inherited from the original line at the same index.

AEAT R code. By default it is derived from correction_reason: error_fundado → R1, concurso → R2, incobrable → R3, everything else → R4; a corrective of a simplified (F2) invoice is always born R5 regardless of the reason.

correction_code overrides that derivation, but is validated against the legal matrix — original F2 → only R5; original F1/F3 → only R1–R4.

Any other combination returns 422 with the legal allowed_values.

Limits: draft, overdue, cancelled and annulled originals return 422 (an overdue invoice must be paid or voided first); a corrective can never itself be corrected — issue a new corrective of the original instead.

List every corrective of an invoice with GET /v1/invoices/{id}/correctives.