I am new to Actuate (due to job move) and am trying to figure out how to a write a subtraction filter in a multiple ihput filter. This problem stems from the fact that I need to filter a field value from one result set in a diffenent data source. ex display row 1 if column is null in datasource n table. Our data is in 2 oracle tables in different data sources. ls there an example on this anywhere? Note - The Actuate book calls it a subtraction filter but shows no example.