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

Create a category
  • Go to "Inventory Management" / "Product/Job code management"
  • Click on the spy glass right nexto to the "Category" field
  • In the "Product/Job Categories Management" click on the "+" signt to add a new cateogory
  • Choose random category number
  • Choose "Category Type" - USED VEHICLES
  • Activate the option "Allow product purchases"
  • Save