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Haven't got a scenario to test with easily, but I'd look at using a Formula(numeric) highlight condition and something like CASE WHEN ROUND({custcol.field1}/{custcol.field2}) = {custcol.field1}/{custcol.field2} THEN 0 ELSE 1 END greater than 0.

<https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions088.htm#i77996|MOD> or <https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions133.htm#i1300767|REMAINDER>

usually mod unless you are doing something unholy with negatives