The list of drillable regions is a member specification defining areas of the database that should allow drill-through using the specified URL. The administrator defines the list of drillable regions using a member specification of members from one or more dimensions. Define the member specification using the same Essbase member-set calculation language that you use for defining security filters. For example, the following is a valid member specification, indicating all eastern states, except New York, for months of Qtr1: @REMOVE(@DESCENDANTS("Eastern Region"), “New York”), @CHILDREN(Qtr1).
The number of drillable regions in a drill-through URL is limited to 256. The number of characters per drillable region is limited to 65536.