Framemaker XML Output Issue

I have an issue with an attribute not being exported to XML from FM8.

Here is the excerpt from the DTD:

<!ELEMENT std.table.header (std.table.row+)>
<!ATTLIST std.table.header
  cols CDATA #REQUIRED
  rowsep CDATA "1"
>

The first issue I had was "cols" not showing up as an attribute in the Structured View. I solved with issue (with the help of MarttiP) by adding it to the EDD as shown below:

Element (Container): std.table.header
General rule: std.table.row+
Attribute list
Name: cols  Integer  Required

Now the issue I am having is on export of the XML, the "cols" attribute is not being exported and I am getting an error "required attribute 'cols' not provided". Any suggestions?