diff --git a/docs/n8n/delivery-note-ocr.md b/docs/n8n/delivery-note-ocr.md
index 489987f..0490dea 100644
--- a/docs/n8n/delivery-note-ocr.md
+++ b/docs/n8n/delivery-note-ocr.md
@@ -344,7 +344,7 @@ Watch the workflow's execution log in n8n and the DN's `processing_status` in Po
 
 ## Changelog
 
-### 2026-09-17 — disconnected the split branch (workflow edit pending)
+### 2026-09-17 — split branch pending disconnection (workflow edit pending)
 
 The branch `Is first delivery note?` (false) → `Create split DN record`
 in workflow `Delivery Note OCR` (`wVbLw4paISkbrIpE`) **needs to be
diff --git a/scripts/migrate-dn-item-units.py b/scripts/migrate-dn-item-units.py
index b3696b6..c8cecc2 100644
--- a/scripts/migrate-dn-item-units.py
+++ b/scripts/migrate-dn-item-units.py
@@ -173,4 +173,4 @@ def main(apply: bool) -> None:
 
 if __name__ == "__main__":
     main("--apply" in sys.argv)
-    print("\nDone.")
\ No newline at end of file
+    print("\nDone.")
diff --git a/src/lib/dn-item-row.test.ts b/src/lib/dn-item-row.test.ts
index 3e7fbc9..97e949f 100644
--- a/src/lib/dn-item-row.test.ts
+++ b/src/lib/dn-item-row.test.ts
@@ -131,4 +131,4 @@ describe("buildDeliveryNoteItemRows", () => {
       "OCR 95% · desc: G6 Sub Base · unit: kg · rate: 168.50 · match: 100%",
     );
   });
-});
\ No newline at end of file
+});
diff --git a/src/lib/dn-item-row.ts b/src/lib/dn-item-row.ts
index a285d17..3b06148 100644
--- a/src/lib/dn-item-row.ts
+++ b/src/lib/dn-item-row.ts
@@ -25,7 +25,8 @@ export interface PoItemLite {
 }
 
 export interface DeliveryNoteItemRow {
-  /** Null when unmatched or unconvertible. */
+  /** Null when unmatched or unconvertible. Non-null with `qty_received = 0`
+   *  when the id is unverifiable (PO items could not be fetched). */
   purchase_order_item: string | null;
   /** In the PO line's unit. Zero whenever purchase_order_item is null. */
   qty_received: number;
@@ -156,4 +157,4 @@ function asNumber(v: unknown): number | null {
     return Number.isFinite(n) ? n : null;
   }
   return null;
-}
\ No newline at end of file
+}
diff --git a/src/lib/utils.test.ts b/src/lib/utils.test.ts
index 321bd1b..0243ecf 100644
--- a/src/lib/utils.test.ts
+++ b/src/lib/utils.test.ts
@@ -23,4 +23,4 @@ describe("formatQtyDual", () => {
   it("falls back to the raw figure when nothing converted", () => {
     expect(formatQtyDual(0, "ton", 12, "m3")).toBe("0 ton · 12 m3");
   });
-});
\ No newline at end of file
+});