Goal
Verify the completion ACK reached the server.

Steps
1) Identify which station bumped/completed the order.
2) Check whether other KDS stations saw the completion at the same time.
3) Ask staff:

• Did the order disappear briefly before reappearing?
• Or did it never leave on some screens?
  4) If completion was inconsistent across stations → ACK loss likely.
  5) Proceed to P-000124-03.

Notes

• ACK loss is most common during network hiccups or reconnects.