Quote model : Update description with modification into product.quote

Quote model : Update description with modification into product.quote

Greetings.

I've created a model for quote.
This model currently read Product.Description.

When a saler create a new quote, he select different products.
He may change the description of the product, within the quote, in order to match customer need.

When i Print the quote, my model show the initial description which was on the product, instead of the new description of the product, modified by the saler.

What can I do, for the PDF to be updated ?

Thanks,

Claire