The original version of the Data Publisher that was created to work with SharePoint 2003 allowed the user to map to read-only columns as destination columns. However, in SharePoint 2007, this results in invalid field mappings and causes an error. The error is:
Exception from HRESULT: 0x80040E14
If you receive this error, you will need to remove the existing Data Publisher web part from the page and replace it with a new Data Publisher web part. Alternatively, you can keep the existing Data Publisher on the page, reset all of the configuration options, and start over, ensuring that no read-only columns are used.