Here, vPN_NextMilestoneDevelopment is the expression of my bar chart, and the hover-over shows "Duration : x days" which is the thing I don't want to show in my excel. Actually I would love to have just the x exported so I was counting on disabling the export of that expression from the excel and add another one giving only x.
Unfortunately, the hidden columns always show up in the export. A workaround is to create an additional chart that contains just the columns you want to export. That chart can be minimized and users right-click-send to Excel. Another approach is to hide this second chart and export to xls using a macro with "ServerSideExportEx'. You can trigger the macro with a button placed on top of the main chart.
