Limited number of free samples in cart!

[maxalerator]

Dear community members,

 

In my Prestashop environment I offer free samples to the potential customers. Each product has several color attributes with custom textures and the attribute "free sample" that decreases the product price to €0,00.

 

I want to offer my customer a limited number of free samples. For instance when i add samples to the cart of three different products, or from the same product, I want them to get an error message that says: "The maximum number of free samples per order is limited to three"

 

The combination of a free sample always contains the id_attribute_group='243' and the attribute_id='3001'.

 

I already found these related post, so far:

 

Maximum of one product at a time

 

Limited quantity for all products

 

Hopefully someone can help me to to figure it out. 

 

Thanks in advance and have a good day!

 

 

Max