## Service Manual / Structure

## 1. Input files

Use a CSV with unique SKU identifiers.

Preserve blank fields and original units.

## 2. Validation

- 2.1 Totals

Quantity multiplied by unit price gives each row total.

## 2.2 Missing data

Do not invent a value for a blank note.

3. Delivery

Save a reviewed CSV and keep the source filename.