This is because the
developer, before starting the Decomposition Tree Wizard, reset everything in the view
to the defaults. This is accomplished by clicking on the Reset button on the toolbar.
The reason why the developer would choose to reset everything to the defaults
is simple yet important: the wizard will take the values of the current view as the
starting point. In other words, if the year had been set to 2001 instead of the All
level, the decomp would contain data for only the year 2001. Some developers and
analysts jump into the decomp without realizing that they have inadvertently filtered
the data based on selections made on a view. They assume, incorrectly, that the
wizard will always start with default values of the All levels for all the dimensions.
In order to ensure this, it is important to reset the current view using the Reset
button. There are times, of course, that developers and users choose to start with
values other than the All members, and this will be discussed in a moment.
In order to filter any particular background dimension, the developer or user
can click on the Change button. This opens the Grouping Items Editor, also shown
in Figure 6-43. From here, the user can choose a member from any dimension
to use as a filter. You should understand that this means a single member. Unlike
the background for a chart or grid, the decomp doesn??™t allow multiple selections
and sum them together, nor does it add a slicer to the top of the screen.
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