External web service call from WebDynpro for ABAP

Hi...
I'm inspecting Web Dynpro For ABAP, and trying to call external web services.
I'm created Web Service, CAF-AS.
I create the proxy class(se80) and Logical Port(lpconfig), and I take the web service in componentcontoroller of my web dynpro using Web Dynpro Wiserd.
Though I expected the context to be registered by the same type as the service interface,
they are created strange structure as follow.
<Context>
CONTEXT
---FIND_BY_PARAMS
IMPORTING
INPUT
CONTROLLER
ORDER_TEXT_BY_PARAMS_REQ
---EXPORTING
OUTPUT
CONTROLLER
ORDER_TEXT_BY_PARAMS_RES
The CONTOROLLER is defined by the type PRXCTRLTAB, and
ORDER_TEXT_BY_PARAMS_* has deep structure, as follow.
ORDER_TEXT_BY_PARAMS_REQ
---CONTROLLER type:PRXCTRLTAB(structure)
---QUERY_TABLE type:ZTABLE_NAME
---QUERY_FIELD type:ZFIELD_NAME
---QUERY_OPTIONS type:ZORDER_TEXT_QUERY_OPTION_TAB
I want to use only service paralmeters, that is named query_*.
I tried to excute the webService but dump "OBJECTS_OBJREF_NOT_ASSIGNED" occurs.
I think I must set any value to CONTOROLLER,?but I have no idea What & How I should set value.
please let me know, what is the CONTOROLLER, and how to call external web services.
Regards,
Naoya Tsugo,

I solved problem by myself.
There was carelessmiss in activation of LP.
Now, I'm closing the topic.
Thanks and Regards.
Naoya Tsugo,

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