b2b - No items in the shopping basket

Hi all.

In the b2b, I search a order completed. Then, I transfer one item to the shopping basket. I select the type of transaction and the b2b go to basket. When I push the button "Display/Change Product Configuration" to change the configuration it is no displayed and the item is deleted.

In the header only say "No items in the shopping basket".

Could anyone give me some idea of what happens?

CRM 7.0. Don't have dumps in SE59.

Thanks for your help.

Martí