excel: cannot save or export xml data

[nolefoume]

I come across a excel XML export problem. To simple the question, I do the next steps:[*]Data>>from XML data import. Actually, I want to export it back to XML file again after somemodification on data (those first line variables never change)[*]Then click Develop>> export. It shows " cannot save or export XMLdata.The XML maps in this workbook are not exportable". (even I donothing modification on data).I watch several export tutorials video on YouTube already, but seems not cover my problem. I haven't find the problem yet.