Can I use the Sharepoint connector on a custom object?

Hi,

I have created a custom object in BC (table, listpage and cardpage). In the table mapping I can select my new table and I have added the factbox to the cardpage:

            part(“SharePoint Factbox EFQ”; “SharePoint Factbox EFQ”)
            {
                ApplicationArea = All;
            }

Now the factbox appears on the page, but when I try to drop a file it gives the error “The entity is not complete, cannot map a folder.”

What am I missing?