I've created an invoice summary report that sums Gross and Net for a range of dates set by the user  but can't get rid of the detail line otherwise it doesnt summarise.

Open Report Designer ; Click - File -New - Report  - Select Invoice - click next . Select FIelds box - click the plus next to INVOICE. SCroll down  to INVOICE_GROSS , click ther single right hand arrow then do the same for INVOICE_NET. Click Next. CLick Next. CLick Next. CLick Next. Type something meaninigful in the Report Name , Click Finish. CLick Report Click Criteria . Click INvoice_Date and click modify. Click Status box. Select Enabled. Click OK Click OK. CLick View. Click Preview. CHange date criteria. Click OK . See waht comes up. If OK save the report as something meaniningful.

If really required I can supply my test report