Problem in CAF- UI with web dynpro

Hi all.
I am creating a caf module . It has external service , entity and application service.
after i have designed all these three i have created the web dynpro model.
the model class has A , Q, P as suffix of the classes . Whai is the meaning odofthis A , P amd Q .?
also when i try to create an object of any of these after mapping it gives an error -
The <node> type cannot be instiantiated . What does this mean?
i need to map a UI screen to an search query function of the application service
and to call that serice on the click of button.
please help me in this regard
Thanks
points asured for help

Hi Anish,
Thanks for your msil
I have 2 different landscapes to work on .
on one my caf project is working fine ,
but it is throwing the linkage error or also   at times java.lang.IncompatibleClassChangeError
java.lang.IncompatibleClassChangeError
    at com.sap.recaf.services.recaf.userservice.UserServiceProxy.serviceModule(UserServiceProxy.java:20)
    at com.sap.recaf.services.recaf.userservice.UserServiceProxy.createCallbapiQuery(UserServiceProxy.java:43)
    at com.sap.test.user.User.wdDoInit(User.java:101)
    at com.sap.test.user.wdp.InternalUser.wdDoInit(InternalUser.java:224)
    at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.doInit(DelegatingComponent.java:108)
    ... 28 more
it gives the hint ---
If the exception message indicates, that the modified class is part of the Web Dynpro Runtime (package com.sap.tc.webdynpro.*) then the running Web Dynpro Runtime is of a version that is not compatible with the Web Dynpro Designtime (Developer Studio or Component Build Server) which has been used to build + compile the application.
I think the problem is of the config settings ,
can u give any further suggestion?
bye

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