When adding products to a Sale Order, using the "Search" option (SaleOrderProducts/searchProductStock), the results are filtered by Product Status, as configured from the Customers Warehouse Settings, "Minimum Status".
The issue, however, is that it's not obvious that stock is being filtered out. I had a case yesterday where the stock was "verified" (not "Allocated"), yet I couldn't see it in the search on the Sale Order. My first instinct was that something was wrong, and it took a while to find the option to modify.
If the system could say:
"Only showing stock which is in 'Allocated' status or higher - click here to change this setting"
It would have saved me quite a few minutes hunting for the issue.