Somme products are not displayed in order detail

Hello everybady,
I’m new at Dolibar. I installed the 6.0.7 version and imported somme data (products, prices, customers, etc).

When I create a customer order and want to add product to it, i find that somme products does not appear in the combobox while others do.

Knowing that i coudn’t find a difference from whose displayed and the others.

Thank you in advance for your help.

Hello,
The product have to be “To purchase” with a price.