Method setQuantity

api/src/main/java/com/grash/model/Part.java:206–209

(double quantity)

    //Location

    public void setQuantity(double quantity) {
        if (quantity < 0) throw new CustomException("The quantity should not be negative", HttpStatus.NOT_ACCEPTABLE);
        this.quantity = quantity;
    }

    public void setMinQuantity(double minQuantity) {
        if (minQuantity < 0)