diff --git a/src/components/delivery-notes/delivery-note-editor-dialog.tsx b/src/components/delivery-notes/delivery-note-editor-dialog.tsx
index 9fa2f32..de106a1 100644
--- a/src/components/delivery-notes/delivery-note-editor-dialog.tsx
+++ b/src/components/delivery-notes/delivery-note-editor-dialog.tsx
@@ -159,7 +159,10 @@ export function DeliveryNoteEditorDialog({
         const res = await fetch(
           `/api/v1/delivery-notes/items/${encodeURIComponent(line.orderItemId)}/pricing`,
           {
-            method: "POST",
+            // PATCH, not POST. The route only exports PATCH, and a
+            // POST to it answers 405 — which surfaced as
+            // "Could not save line ... (405)" and saved nothing.
+            method: "PATCH",
             headers: { "Content-Type": "application/json" },
             body: JSON.stringify({
               quantity: Math.max(1, Math.round(line.quantity)),