Issue:
When you create a new AM in ADF, you may be prompt of that the Package Ref of BC4JDataControl is not found. But actually, you already setup AM configuration correctly. And DataBindings.cpx is maintainaced by framework automaticlly. So, there should be nothing wrong with the file.
Solution:
According ADF doc, BC4JDataControl element is added only the first time that a data control object (attribute, collection, operation, or method) is dropped onto a page in the project. So, we can update the BC4JDataControl config by create a temp JSF/JSP, and drag our Data Control to the page, then the BC4JDataControl config will be getting update. The error message should be gone.