I see the url problem...
Ther is no support for macros in the Dataset LinkURL due to the parsing format Key=Value. Alos, the Macro #?# can mean X value or Y value as the #?# in the dbChart is the series values of the record (row) or field (column). In case of Pie chart, there is only one Y value or the Label value. So this one looks simple but it is not.