Unable to extend from object Application Module

Hi All,
oracle.apps.icx.por.reqmgmt.server.ReqMgmtAM has an invalid View Instance AllReqsVO.
In 11i there were customizations in iproc in which the ReqMgmtAM has been extended and some methods have been coded .Now I am working on porting the changes to R12 instance and wanted to redo the changes R 12.1.2 jdeveloper version 10.1.3.3.0.
The extended AM in R11 has two overriden methods getGroupVOName, bindSummaryQueryInnerWhereParams to call two extended VO objects .
Now in R12 Jdeveloper when I am trying to extend the ReqMgmtAM it does not allow me mentioning oracle.apps.icx.por.reqmgmt.server.ReqMgmtAM has an invalid View Instance AllReqsVO.
What should I do ? Please advise .
The changes is to have a poplist instead of MyRequisitions and choosing MyRequisitions or Mylocation requsitions will show all the requisitions belonging to that Deliver to location ...and user should be able to go the requisition details page and should be able to copy to cart and perform actions as it is .
--Chandra                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

hi
is this ReqMgmtAM a root AM ,if it is so, extension of root Am may cause so many problems ,if u provide your requirement details ,we can go for some alternate solution also .
thanx
Pratap

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