prerequisites to integrate a view (with argument) into a panel ?

Hi,
[I've also posted in the panels project]

I've setup a view that use a nid argument and a node type filter (say type 'A'), that works :
the view gives me some specific fields for a given node if its type is 'A'

but I can't make it work in a panel, the argument is not forwarded from panels or misunderstood.
the panel has a nodeID context argument (node/% url) with the same type 'A' selected. it works for the other content I've added to the layout.

is there something special to setup in that view with args to make it work in a layout panel ?
setup a dedicated display ?

when adding the view to the layout, there's a context argument option ("Multiple contexts are valid for this pane; one must be chosen.") : so I've linked the layout context argument (nodeid, that works for other added objects) to the view argument. there's also the arguments checkbox @N %N.. wow... dis a lot of tests, going slightly mad, still doesn't work.

the weird thing is that this context dependent panel view WORKS for some cck block I've added, with no need for any argument setup !!