I added some more tags to increase visibility.
This can be done relatively easily by editing the compound amount column in the results table on your report template. To do this, right-click on the Compound Amount column in the results table and select properties. Then in the Value properties click on the 'fx' button to the right of the value field:
You will then need to edit the expression to add an if/then statement so that any compound amount <0 will be reported as 0.000BDL, like below: