How Invoice Processing Affects Vehicle Data

Source: autosoft-workshop/app/models/invoice.rb

• Processing a service invoice auto-updates: odometer, service hours, next service date
• If odometer field is blank on invoice, vehicle record is NOT updated
• Voiding an invoice REVERSES stock quantity changes
• Vehicle sales and trade-ins create/reverse dealership transaction logs

Support scenarios

• "Vehicle odometer is wrong" → last processed invoice had wrong odometer value
• "Stock levels are wrong after void" → void reversed quantities that were manually corrected