Need to add a new field in OAF by using Extending the View Object. This docement might be useful.
In this Document you will learn from a working example, how to extend view object in OA Framework to add a new field to standard page. This article will also teach you how this extension can be tested from both jDeveloper and also how this can be deployed to eBusiness Suite.
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Extending view object by adding new field in oaf 2011-04-15
Extending view object by adding new field in oaf