Filter Expression Dialog Box
You can use the Filter Expression dialog box to specify filter expressions for Receive shapes. You use a filter expression to express conditions under which a Receive shape receives messages.
To do this
Select a property to be referenced on incoming messages.
Select an operator to determine the nature of the comparison.
Specify a constant value to compare the property against.
Control predicate grouping. AND means the predicate is grouped with the predicate that follows it, while OR means the predicate is separated from the predicate the follows it.
Up and down buttons
Move a selected row up or down in the expression.