IBM Cognos User Manual page 31

Framework Manager Governor Settings
Cognos Transformer cannot view or override Framework Manager governor
settings with an exception of the governor setting that controls null suppression for
SAP BW data sources.
For more information on Framework Manager governor settings, see the
Framework Manager User Guide. For information about setting null suppression for
SAP BW data sources, see the Cognos Transformer context-sensitive help for the
Suppress null values for SAP BW data sources option on the General tab of the
Preferences dialog box.
Using Calculated Query Items
Review the rollup rules in Cognos Transformer when you use calculated query
items as measures to avoid incorrect rollup results. For example, a rollup rule of
Sum should not be applied to a measure that uses a calculated item when the
value is expressed as a percentage. For more information, see "Rollup Functions"
on page 331.
Folders and Shortcuts in Imported Packages
Cognos Transformer does not display empty folders and folders that contain only
calculations. Shortcuts to this type of folders, as well as empty query subjects and
namespaces, are not displayed either.
Folders that contain calculations and query subjects are displayed, but without the
calculations. Shortcuts to this type of folders are also displayed.
Handling Model Changes
When the model associated with a package or report is subsequently altered, for
example, query subjects are removed, the Cognos Transformer model that uses the
package or report as a data source is not automatically updated to reflect the
changes.
You can use the Modify Columns feature to detect and fix the changes. Otherwise,
the changes in the source model are detected only when queries are executed, or
when you run Check Model on the Cognos Transformer model.
Rollup Aggregate Settings
When you use columns from a data source that uses package-based measure query
items as measures in Cognos Transformer, Cognos Transformer maps the rollup or
regular aggregate setting of the package source query items to a corresponding
measure rollup type in Cognos Transformer. However, when you use a query item
from a data source that uses report-based measures as query items in Cognos
Transformer, Cognos Transformer always creates the measure with the default
rollup type Default (Sum) because the report metadata does not return any
aggregate settings.
When you work with a data source that uses report-based measure query items,
review the measure properties defined on that data source to ensure that the
measure has the appropriate rollup type.
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Chapter 3. Data Sources for Your Model