Hi,

You can manage this process using the Repair module as follows:

    Create a Repair Order for the customer's product and set the correct customer and product details.

    Set the "Location" as the customer location and the "Delivery Location" as your warehouse (e.g:WH/Stock). This will bring the customer's product into your inventory without affecting average cost.

    In the Parts tab, add the components used for the repair (set type as “Add”) so they are consumed from your stock, which will affect average cost accordingly.

    Complete the repair and mark it as done.

    Click “Create Invoice” to generate a sales order or invoice for the customer, including the cost of used components and any service charges.

Hope it helps.