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Select Fields Dialog Box
You can use the Select Fields dialog box to select the fields according to whose unique values to calculate DistinctSum. This topic describes the options in the dialog box.
Designer displays the Select Fields dialog box when you select DistinctSum as the aggregate function of an object and select the ellipsis 
to set the Distinct On option, or right-click one or more aggregations in a crosstab and on the shortcut menu select DistinctSum from the Switch Aggregate Function submenu.
You see the following options in the dialog box:
Resources
This box lists all the available data resources that you can add to calculate DistinctSum.
Add button
Select to add the specified fields in the Resources box for calculating DistinctSum.
Remove button
Select to remove the specified fields from the Distinct On box.
Distinct On
This box lists the fields according to whose unique values you add to calculate DistinctSum.
OK
Select to apply your settings and close the dialog box.
Cancel
Select to close the dialog box without saving any changes.
Help
Select to view information about the dialog box.