How to pass data using interface node between two components using component usage???

Hi Team,

I am trying to pass the data between two components Comp A and Component B using interface node.

here is the steps i am doing...

1) I had created two components Comp A and Comp B.

2) I had created Interface node with cardinality 0..1 and added attribute PERNR inside node and binded same to view level to input field in Comp A.

3) I had created component usage in Comp B and mentioned Comp A as used component.

4) i had mapped the interface node using interface controller and same is reflecting to my component controller context of Comp B.

5) i coded inside WDDOINIT and trying to read the data of interface node using code wizard the PERNR value of Interface node in Component B and used method INSTANTIATE used component and method call in used controller but unfortunaletly not getting the pernr value in Comp B whereas the same value i am getting inside Comp A's different method.

Do i need to check the INPUT ELEMENT(Extn.)??? if i am checking it i am getting dump stating the mapping of main component for interface node is not completed.

Please help in this issue.

Thanks

Shehzad.