Thanks for reply
I have checked and it is of Long Type
its giving this exception
"java.lang.ClassCastException: oracle.apps.fnd.applcore.oaext.model.OAApplicationModuleImpl cannot be cast to oracle.apps.scm.landedCost.landedCosts.reviewPoDetails.uiModel.applicationModule.MaterialPOAMImpl"
so you may want to check if am appmodule returns the right VO.
check getPoSchedAssociatedCharges1() in the app module to see if it returns the right VO - assuming it has been hand changed by you and might have missed something.
Or it may be that the VO is not part of the AM, or you have not exposed the View accessor methods exposed to the client in the AM or VO.