The 30-second check

Do this before you start looking for a cause. Three steps, half a minute, and part of the problem goes away.

1. Reload the page and clear the cache#

Cmd + Shift + R on Mac, Ctrl + F5 on Windows.

The browser might be holding an old version of the app. A missing button, "changes don't save," an interface that looks like last month — that's almost always the cache, not a bug.

2. Check the invoice's supplier#

Open the invoice and see who's listed as the supplier. Product mappings live inside the pair "restaurant + supplier": if the supplier is wrong, the lines will be empty even though the mappings are intact.

3. Look at the marks on the lines#

The service flags anything suspicious on its own: looks like a duplicate, not in history, not on the photo, differs from the photo, above the price list. A mark is a hint about where to look, not a sign that something's broken.

Didn't help? Find your symptom in the list on the left — the articles in this section all follow the same pattern: what it looks like, what to check in order, how to fix it.