Conditions determine whether the mapping is to take place. The
following steps show you how to add a condition other than the default of
true.
From the Message Flow Mapping editor Overview, select
the Target Value that you want to edit. A small box appears
at the end of the row.
Click the box to open the Compose Mapping Expression editor. Alternatively, from the Outline view, select the value that you want
to edit and right-click. Select Edit
Mapping from the pop-up menu and the Compose Mapping Expression
editor appears.
Click the Apply Condition box.
Enter the condition into the box below, and click OK or Apply when you have finished. For example: Source.CompanyName = 'IBM' where IBM
is a literal. If this condition is true, the mapping is made.