Have Available product and preorder on only one order

Hi There,

I use the free plug-in, I would like to know if there is a way to have on the card available and pre order product at the same time ?
I receive an error message when I want to mix availabale and pre order on the cart : “We detected that your cart has pre ordered products. Please remove them before being able to add this product.”
Ot is it only a pro version festure ?
Thanks for your support and nice plug-in as well !
Rob