A part is a catalogue (non-designed) line item — hardware, an accessory,
or a bought-out component — added to an order alongside designed window/door items. Parts are
added from the order’s Items tab with Add Part, which opens the
Part selection dialog; pick a part, choose Next, and the part editor opens for
pricing, quantity and supplier.

Finding a part — the search field

The Part selection dialog lists sellable parts a page at a time. Choose a
Filter by field and type in the search box at the top: the list narrows as you
type. There is no need to press the search button or type a minimum number of characters —
each keystroke re-runs the search (after a brief pause, so fast typing does not fire a query per
letter) and the results shrink to match. Clearing the box restores the full list.

Which parts appear in the list

Only parts that are sellable and have a valid supplier are offered for
selection. A part is hidden from the Add-Part list when:

• it has no supplier assigned, or
• its supplier points to a partner record that no longer exists (an orphaned or
  invalid supplier).

This keeps parts that cannot be purchased or costed out of the picker. If a part you expect to
see is missing, check that its stock record has a supplier and that the supplier partner still
exists under Customers / Suppliers.

Supplier selection in the part editor

When the part editor opens, OpenJanela pre-selects the part’s default stock
supplier in the Supplier drop-down. If that supplier cannot be resolved — for example
the partner was deleted — the editor simply defaults the drop-down to None so you can
choose a supplier manually. It no longer stops with an error, so the part can always be added.