In order to use the "Used car" module in GEM-CAR you need to have:

• A special category for used vehicles,
• Your own company created has a tax-exempt customer,
• Special payment method for internal work ( reparations performed on the vehicle).

• Go to "Inventory Management" / "Product/Job code management",

• Click on the spyglass right next to the "Category" field,

• In the "Product/Job Categories Management" click on the "+" sign to add a new category,
• Choose random category number,
• Choose "Category Type" - USED VEHICLES,
• Activate the option "Allow product purchases",
• Save.