Define complex logic strings and use functions in conditions by configuring advanced
options of a When rule.
For example, if you create conditions 1, 2,
3, and 4, you can define an advanced logic
string for the conditions, such as 1 AND (2 OR (3 AND 4).
Note: As a best practice, use the Conditions tab to configure and update
the rule. Your configuration populates the conditions array and the Logic
String field on this tab. If you add, change, or delete rows, or edit the
Logic String field, you can no longer use the
Conditions tab. Updating values in conditions or using the
Options area does not disable that tab.
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In the navigation panel of Dev Studio, click , and then open a rule that you want to edit.
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On the rule form,
click
the Advanced tab.
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In the drop-down list, select an expression type.
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Enter a label for the expression, for example, A.
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Complete
an expression.
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If you want to add more expressions, click Add condition, and
then repeat steps 3 trough 5.
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In the Logic string field, enter the Boolean logic operations
performed on the Conditions array to evaluate if the condition is true or false at run
time.
If you created the conditions on the
Conditions tab, the system
populates this field by using the AND and OR operators, in addition to the group
hierarchies that are defined on the condition tree.
You can use
and, or, and not
in the statement. Use parentheses to control the order of evaluation.
For example: (A and B) or (C and not D)
Result: When you save the rule, if the form contains only one test row, the system
inserts the label for that test row in the Logic string field. If
you have more than one row, the system requires all rows to be true. If you want a
different outcome, revise and save the statement again.
- Optional:
In the Advanced options section, in the Allowed
functions field, select a function alias that restricts the available
conditions to the one in this field by clicking Add function.
If you add multiple functions, the top entry is the default one.
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Click Save as.