How to filter negative records

We have added custom row in kreport called Final Amount.

We are doing field1 - field2 to calculate amount for Final Amount column.

Now, we want to display only -negative values in the table. How to do it?

@rsp Here is an example:
I am using Opportunities and I just created negative values by doing a -50000 on the field amount:

Then in the Filter Tab I use the same custom SQL. Caution: under Filter {f} will not be replaced by the field name. So write the field name directly

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