If "Site Data" is an element, try "E..\..\Site Data|Site Name"
If "Site Data" is an attribute with a sub-attribute, try "E.\..|Site Data|Site Name
Due to how AF pathing works when ERD combines the context and the path, if you are going up, you have to first define the element you are starting at, i.e. "E.." (E is the context handler followed by '.' for the separator to the path, followed by '.' to reflect the current element).
Also, "\|" is not legal as far as I know in an AF path. Either the next item is an element (in which case, you put a "\". or it's an attribute, in which case you put a '|'.