When I use the OR logical expression, why isn't the rule firing correctly?
Business Rules, Logical expressions
Logical expressions use AND (&) and OR ( | ) to define the relationship between a rule's conditions. The following shows an example of a logical expression in an incident rule.
The logical expression: 1 & 2 & 3 | 4
This expression should fire the rule even if only condition 4 is met. However, the best practice for rules in this case is to add parenthesis around the 1 & 2 & 3.
So it would be: (1 & 2 & 3) | 4
If you do not use parentheses, AND always has precedence over OR, which determines the order of execution.
More examples of a logical expressions:
1 & (2 | 3) - This expression requires that condition 1 be met and that either condition 2 or condition 3 must also be met.
1 & 2 | 3 - This expression requires that both conditions 1 and condition 2 be met or that condition 3 be met.