Padding members

IBM® Cognos® Dynamic Cubes inserts padding members to balance unbalanced and ragged hierarchies. Padding members do not represent actual dimension members; they are visible only for navigational and performance reasons.

You can reference a padding member in an expression in the same way as any other hierarchy member.

Padding members can include a blank caption or the same caption as the parent. The following diagram illustrates a ragged hierarchy with a padding member included in the Europe branch. A blank caption was used as the caption for the padding member.
Figure 1. Example of a ragged hierarchy with blank padding member
Example of a ragged hierarchy with blank padding member
In the IBM Cognos studios, the metadata for this hierarchy with blank captions would show a level without a caption, as in the following example:
Figure 2. Example metadata showing blank padding member
Example metadata showing blank padding member
The metadata for the same hierarchy using parent captions would show a level that uses the same caption as the parent, as in the following example:
Figure 3. Example metadata showing parent padding member
Example metadata showing parent padding member

A dimensional member can have only one child padding member.

The use of padding members can result in skewed calculations related to the members of a hierarchy level. For information about removing skewed data from reports, see Removal of padding members from reports.