With the Filter Heater you can actively intervene in the import/export transformation process. It is mainly used in combination with the IfThenElse Heater or with the .NET Script Heater in complex Definition sets. The Filter Heater has exactly one input (of BOOL type) and no output and this Heater is always evaluated first, before all other Heaters. If this Heater is delivered a Boolean value of TRUE , the record on the READ side is filtered out (skipped) and is not carried forward to the WRITE side.

Please also refer to the general information on the use of Heaters (functions)