Hi,
Have you bind your component A and component B context nodes in WD_USAGE_INITIALIZE in componet A component controller.
example code:
Case iv_usage_name.
when 'your componet usage name'
iv_usage->bind_context_node( iv_controller_type = cl_bsp_wd_controller=>co_type_component
iv_target_node_name = 'IMAGENAVIGATION' "this one is current componet node
iv_node_2_bind = 'IMAGENAVIGATION' ). " target componet context node name
Best Regards,
Dharmakasi.