Looking for help - minimum quantity problem

[manada]

I saw few contributions of minimum quantity , anyway none of them resolves my problem.

 

This is a scenario

 

Let say product name is "Shirt" with part numer "0001" and have some attributes, lika a size color etc. Minimum amount to buy is set to 20. The question is how to let customer to pick product with different attributes around the minimum quantity amount?

 

Ex. To let them to pick:

product named "Shirt" part number "0001" size XXL - 5 pieces

same product but size SM - 12 pieces

and again, same product with with size M - 3 pieces.

 

The total quantity for that is 20 which is same like the set one in admin for that product.

 

Most of contributions will do three seperate lines in shopping_cart with product with different attributes (which is fine) and minimum quantity will be forced to be 20 pieces for each (which is not fine)!!!. So it doesnt let to customer to buy total 20 pieces of same product with different attributes but it forced him to buy 20 of each.

 

Can you help me out with that problem?

 

Thank you very much in advance.

 

Adam