Not able to find the VO AttachmentsVO while invoking managed attachment from the page containing thi

I have to add the managed attachment in self service pages of EBS.I ma trying to test it in one page (EX:Scholarship order ) where I found the VO named AttachmentsVO in the about the page section of the OAF page.So I have set this as business object value  and one of the parameter of this as business object type in OAF_AXF_CMD_PARAMS table.

But when I am opening this page I am getting the below error message and not able to invoke managed attachment.

"

Message not found. Application: AK, Message Name: AK_AXF_VO_NOT_FOUND. Tokens: VIEW_OBJECT = AttachmentsVO;