Scrap parts and trace history

On the build screen, you can scrap individual units at any stage and view a complete trace of every move a part has made through your shop.

Scrap partsCopy Anchor Link

To scrap one or more units from the current step:

1. On the build screen, locate the part card you want to scrap from.
2. Click the trash icon (Scrap parts) at the left of the part's control row. It is only enabled while the part has pending units — staged units must be unstaged first.
3. In the Scrap parts dialog, set the Scrap quantity (up to the number of pending units shown under the field).
4. Schedule replacement is switched on by default. Leave it on to have replacements produced, and adjust the Replacement quantity if needed — it defaults to the scrap quantity. Switch it off to scrap without replacing.
5. Optionally type a reason in the free-text field ("Provide a reason for scrapping these parts"). If you leave it blank, the scrap is recorded as "No reason provided".
6. Click Scrap part (or Scrap N parts). The scrap appears in the Scrapped section of the Outgoing rail.
7. Hit Progress to commit.

⚠️ Scrapping is permanent — there is no server-side undo once you progress. Before you hit Progress, click the pencil (Edit scrap) on the scrap card in the Outgoing rail to change the quantity, replacement, or reason (Update scrap), or click Undo to return the units to pending.

When you include a replacement, the system tops up the existing production run at its first operation — the replacement units join the same work order and follow the same routing from the beginning. They appear at the work order's first operation in the backlog, not on the build screen you scrapped from.

ℹ️ There is no data lineage connecting a scrap record to its replacement units — the replacement is a quantity addition to the existing run.

After you progress, committed scraps move to the Progressed section of the Outgoing rail, where you can expand each one to read its reason.

Read the production traceCopy Anchor Link

The trace for each part is shown on the build screen in place, and refreshes after you progress. It lays out each of the part's work orders as a row of operations, listing the groups the part has passed through at each operation (each links to that group's build screen) and any units scrapped there.

To view the full trace for a part:

1. On the build screen, locate the part card.
2. Click the route icon (Production trace) at the top-right of the card. The trace expands below the card; click the icon again to collapse it.

Every move is a permanent record. A part's trace covers its entire history from the first operation to its current position.

💡 If a part was split — for example, two units staged together and one unit staged separately — each chunk appears as its own entry in the trace, each referencing its source step and work order.