Change minimum quantity of product to order by x products

[rakepl]

Hi,

How can modify the function "Minimum quantity of product" to "Order by" this means

- Minimum quantity of product to order, ex 6 pcs can not buy less than 6 pcs, when click on "+" will add only 1 pcs on product page and in cart page

- Order by, ex 2 pcs (pair of tire", customer can only buy 2 pcs, 4 pcs, 6 pcs and so on, when click on "+" will add the same pcs in package

I used this modification from this post http://www.prestashop.com/forums/topic/181756-class-change-minimal-quantity-of-x-to-only-order-by-x-quantity/ and copy to /override/class/cart.php

but nothing happen for my local shop running on 1.4.10.0.

Anything suggestion or modification ?

I have an idea, maybe can make a combination of these function ?

We can make two option in backoffice, a product can choose

- Minimum quantity to order:

- Oder by x quantity:

A friend of mine use PS 1.3.1 and modified product.tpl, his shop has function "Order by x quantity".

I don't know will this file help ?