Added value: +{
+  "description": "Pass \"$delete\" to unlink the expense this line recovers; the line keeps its name, account and amount. Rebilling is add-only, so any other value is refused.",
+  "type": "string"
+}

Previous value: -"Rebill this expense onto a sales invoice. The line's name, amount and tax come from the expense: a VAT-registered business bills the net amount plus its own output VAT; otherwise the gross amount, untaxed. An expense already on a live invoice is refused."New value: +"Recover this expense's cost on a sales invoice, order or pro-forma (quinvoice or contract id). The expense is copied onto the line once: its name, its category account (the line credits that account, not Sales; an uncategorised expense books to the document's income account, Sales by default) and its amount. A VAT-registered business bills the net amount plus its own output VAT; otherwise the gross amount, untaxed. Later edits to the expense do not change the line. Recovering an expense that is already on a live document is allowed: the response's billedon lists the live documents that already recovered it before this add (this document too, when it is already on another of its lines), so the caller can warn."

Removed value: -{
-  "anyOf": [
-    {
-      "type": "integer"
-    },
-    {
-      "type": "number"
-    }
-  ],
-  "description": "Markup on a rebilled expense, as a percentage of its base (10 = 10%). Only read with expenseid."
-}

Added value: +{
+  "description": "Rebill this expense onto a sales invoice. The line's name, amount and tax come from the expense: a VAT-registered business bills the net amount plus its own output VAT; otherwise the gross amount, untaxed. An expense already on a live invoice is refused.",
+  "type": "string"
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "number"
+    }
+  ],
+  "description": "Markup on a rebilled expense, as a percentage of its base (10 = 10%). Only read with expenseid."
+}

Added value: +"Per-line chart-of-accounts / expense-category id; bills split cost by category at accrual (see list_accounts)."

Added value: +"Line total (unit price × quantity), usually derived from :price × :quantity. Accepts a number or a numeric string."

Added value: +"Optimistic-concurrency token: the line's last-known updatedat (epoch number or ISO string). A stale value is rejected; omit to skip the check."

Added value: +"Unit cost (for margin / cost-of-sales), in :costcurrency."

Added value: +"ISO 4217 currency of :cost, when it differs from the document currency."

Added value: +"Line item description."

Added value: +"Line item id. Required on update_document_item; omit on add_document_line."

Added value: +"Line item name / title."

Added value: +"Unit price (per-unit selling price) in the document currency."

Added value: +"Id of a catalog product to link this line to."

Added value: +"Number of units. Accepts a number or a numeric string."

Added value: +"Id of the parent document (invoice, quote, bill, etc.) this line belongs to."

Added value: +"Internal: correlation id used to return the updated entity to the frontend; omit."

Added value: +"Display order of the line within the document (ascending)."

Added value: +"Unit label for the quantity (e.g. \"hours\", \"kg\")."

Added value: +"Id of a catalog product variant to link this line to."