Connected webpart - init on page

[java61]

I've a page "1" with a list of orders.
When I select an order, I open a page "2" with a webpart on order (connected to list) and a webpart of orders lines (connected to above order webpart).

So :
a- on page 2 : If I click on an order, its lines are filtered automatically in below orders lines list
b- on page 1 : If I click on an order in the list, sharepoint opens page 2 and filters order's webpart on my selected order..... BUT it does not filter the list of orders lines on selected order. I've to (re)select the order in the upper webpart !!

What's wrong, How could I do that ?

Thanks !
Gilbert