You can use the Lookup Options property to configure the lookup. The Enter Property window will display a list of all lookup ports and its current option values.
The properties are:
Lookup Name — The Lookup name is inherited from the associated port and cannot be changed here. To change a name of a port, select Description from the port menu.
Lookup Size — Enter the estimated number of lookup records to optimize memory allocation and lookup performance (this option is described more detail in “DB Lookup”).
Lookup Empty / Null — Empty and Null are normally handled as “unknown” keys, thus returning the lookup default value. If Empty or Null values are valid keys for your lookup, you can enforce looking up the values for these keys by activating the appropriate options.
