You'll have to edit the selection formula. Open the Select Expert. If you do not already have something in the selection criteria, select the Customer field you'll use in your formula. Now click on the "Show Formula" button and then on the "Edit Formula" button. In the formula editor enter something like this:
(IsNull({?MyParameter}) or {?MyParameter} = "" or {table.Customer} = {?MyParameter})
Please note the parentheses at the begining and end. If you have any other selection criteria in your report, you MUST have the parentheses in order for the correct data to be retrieved.
-Dell
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