Constraints

Although Filter Designer can allow the definition of any complexity of selection criteria, there are restrictions in the filters that can be managed by Control Desks. Therefore, to avoid the definition of filters that cannot be managed by Control Desks, the following constraints have been placed on the Filter Designer user interface:

• No more than 100 selection parameters may be defined in total.
• Up to nine compound conditions may be specified. Eight of these must be combined using the logical operator OR and the remaining one must be combined with the rest using the logical operator AND. If there are less than nine, any number of them may be combined using the logical operator OR and one may be combined with the rest using the logical operator AND. The simple conditions within each compound condition must be combined using the logical operator AND.
• The only nesting levels allowed are those allowed within the above restrictions.